How To Requery Cascaded Combobox

Dec 9, 2011

I use this portion ofcode to get combobox1&2 populated from an Access Database:[code]

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ASPxGridView - How To Hide Dropdowns In Cascaded ComboBoxes

Jul 15, 2011

Any resolution to make the cascading dropdowns work as expected when used inside edit mode of AspxGridview. I am using DevExpress Controls.

My requirement is as follow:
If I select country="United States" then populate the "State" combobox and on selection of "State" populate the "City" combobox.
If I select "country" other then "United States" then populate only "City" combobox with cities of selected "country" and no need to populate the "State" combobox. Also I need to hide the "State" combobox. i.e. like

Country State City
ROW1 united states Alaska Douglas
ROW2 Canada Toronto
ROW3 Australia Sydeny
ROW4 united states California Yuba City

Same is required in Editmode also.

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Deleting From A Cascaded DataGridView Populated Via Linq To SQL?

Nov 18, 2009

I am having problems deleting any rows from a cascaded DGV. I get a run time error complaining that I am breaking a constraint almost as if LINQ is try to delete from the parent table. I have 2 DGVs on a form one displaying Species and the other all SubSpecies for the currently selected species and that works fine.

However when I try to delete a SubSpecies I get the following exception:- An attempt was made to remove a relationship between a Species and a SubSpecies. However, one of the relationship's foreign keys (SubSpecies.SpeciesID) cannot be set to null. At first I thought the error was raised by SQL server due to the Cascading Delete limitations on L2S but the error message for that is very different the DataContext.Log doesn't show any attempt to change the data.

The code used to bind the DGV's is as follows:-

Protected Sub BindControls()
Try
DC = New DataClassesWhatToPlantDataContext

[code]....

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DB/Reporting :: ADO Requery Error After VB6 Upgrade?

May 28, 2008

I am trying to upgrade a VB6 application to vb2008 Express and on all of my ADO requeries I get an unhandled message "Operation is not allowed when the form is open" which doesn't make a bit of sence to me. I have an ADO Data control which is bound to a data grid and when the form is loaded I initialize the ADO Data Control using such statements as:strSQL = "SELECT * FROM MyTable WHERE site = " & sCurrentSite

Me.Adodc2.RecordSource = strSQL
Me.Adodc2.Recordset.Requery()
Me.Adodc2.Refresh()

[code].....

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Way To Requery CanExecute In Silverlight MVVM?

Mar 22, 2011

I have a simple LoginForm.Here is how the code-behind looks like:

Private Sub btnLogin_Click(sender As Object, e As RoutedEventArgs) _
Handles btnLogin.Click
If Me.loginForm.ValidateItem() Then

[code].....

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Requery Form Value After Moving Focus Back From Form2?

Jan 6, 2011

I have Form1 based onTable1 with unique records per employee/position. Form1 is used to updated position dates/active status/add new position info for an employee. I have Form2 based on Table2 which has unique record per employee.On Form1, I have a combo box to select which employee's records to view in the detail section. If I select a record from the combo box, the detail displays any existing records from Table1 for that employee. If I need to add a new employee, a command button opensForm2 where new employee is added toTable2, anda new record is also inserted into Table1 with the employee name and ID. When I close Form2 and return focus to Form1, my combo box is refreshed to display the employee just added, however I can't get the detail to show the new, partial record from Table1for the new employee. Form2 is a stand-alone (not a subform on Form1).I've tried hooking Requery to OnGotFocus, but that either doesn't work or isn't activated by returning focus via code.I've tried adding a text box to the detail that contains the unique EmployeeNum and setting the control source of the text box to cboEE.Column(1) (which is the EmployeeNum bound column). Am back to trying to do stuff in code after long absence and
now feel lost in all the variations I've tried.

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Dynamicaly Refresh Databound Combobox Items Based On Selected_index_changed Event Of Another Combobox?

Jan 27, 2010

I am using VB.NET together with ADO.NET to create a program. I have set my TableAdapters as needed and bound the correct tables-columns to my comboboxes.My problem though is this:My combobox2 item is bound to a datatable. The table adapter's Fill method (the select command basicaly)includes apublic variable inthe whereclauseto fetch the correct results. I ll put some code here to clarify it a bit more.Public Class Frm_inv

[Code]...

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Combobox Bug - Text Typed In Combobox Appears In Another Control (textbox) On The Form?

Feb 20, 2012

I have a tab control application, each tab loads a particular user control and each of those user controls will then add other user controls that are used amongst other the user controls. For example, I have an "ucQuotes" page and an "ucInventory" page, when the specific tab is selected, the "uc****" user control is loaded on that page, and in the case of "ucQuotes" and "ucInventory" they both use a control called "ucPartNumber"; a user control consisting of a combobox, textbox, and button. I have no issues reusing the shared user controls, in this case. My problem arises with my "ucQuickPrice" control, as it is always present at the bottom of the tab control form (separate from the tabcontrol, but on the same form), and it too uses ucPartnumber.

Here's my issue, as I type into the ucPartnumber combobox, the text I type does not appear in the combobox, it appears in the textbox of the ucPartnumber control that is being used onthe tabcontrol page. There are no shared instances of ucPartNumber, nor do I have this issue between typing on one tab page and the text showing on the user control of another tab page.I tried just creating the ucPartNumber controls on the ucQuickPrice control, not adding a new instance of ucPartnumber on the .Load event, and the issue persists.

The combobox(s) in question are bound programmatically with about 40,000 items, ".datasource = dataset.tablename" not to a bindingsource. Autocomplete is set to none, I added code to utilize tool tips and the basic combobox filtering functionality. Is this a bug, or is there something I'm neglecting? I'm about 95% complete with this application, and this just happened today. I made the decision, to just reuse the ucPartNumber control on the ucQuickPrice control (originallly it's size and orientation would not fit, but I added some coding to detect what parent is adding ucPartNumber and to change its appearance accordingly). Before, I made this change, I did not have this problem. And, in trying to go back to how I had things set up before the change, the problem will not go away. if the whole control within a control verbage I used is a bit confusing, let me know and I'll try to better explain what is happening. At this point, I'm going to close and reopen vbexpress, as when I started this ordeal, vb started acting weird and wanted me to save all my work, it usually does this before locking up.

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Change List Of Combobox A Based On Item Chosen From Combobox B?

Jun 17, 2011

I am new to vb.net and I am using visual studio 2010. I have two comboboxes on a form, each combobox is set to DropDownList so that a list of items can show in the combobox, but no text is allowed to be entered.

For combobox A, if user chooses item 1, the list of combobox B should be updated accordingly. I think this is quite common on a lot of applications. But I do not know to implement it. I even do not know the keyword to search for the relevant property or event handler.

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ComboBox Reset To Select The Text Of The ComboBox In Windows Application

Aug 10, 2009

I had added the items

1
2
3 to the combobox.

Then I gave the "Select" to the text of the combobox.

How can I able to reset combobox to select the text("Select").

I had tried by giving -1 to the SelectedIndex. But it gives only Empty.

This is for VB.NET Windows Application

I have given an Image for your reference

Image path for the reference [URL]

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ComboBox When Clicking Suggestions Will Clear Combobox Text Area

Mar 26, 2011

When I will click the suggested text shown in the combobox it will disappear.My Combobox btw is connected in a database.If I type Kev then kevin and kevsky will show at its suggestion then when I will click any of it ,the combobox text will be empty or will clear what I typed ("Kev") and will not show what I clicked.[code]

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Reset ComboBox To Select The Text Of The ComboBox In Windows Application

Aug 11, 2009

I had added the items 1 2 3 to the combobox.

Then I gave the "Select" to the text of the combobox.

How can I able to reset combobox to select the text("Select").

I had tried by giving -1 to the SelectedIndex. But it gives only Empty.

This is for VB.NET Windows Application

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.net - Make A Custom ComboBox (OwnerDrawFixed) Looks 3D Like The Standard ComboBox?

May 3, 2011

I am making a custom ComboBox, inherited from Winforms' standard ComboBox. For my custom ComboBox, I set DrawMode to OwnerDrawFixed and DropDownStyle to DropDownList. Then I write my own OnDrawItem method. But I ended up like this:

How do I make my Custom ComboBox to look like the Standard one?

Update 1: ButtonRenderer After searching all around, I found the ButtonRenderer class. It provides a DrawButton static/shared method which -- as the name implies -- draws the proper 3D button. I'm experimenting with it now.

Update 2: What overwrites my control?I tried using the Graphics properties of various objects I can think of, but I always fail. Finally, I tried the Graphics of the form, and apparently something is overwriting my button.

Here's the code:

Protected Overrides Sub OnDrawItem(ByVal e As System.Windows.Forms.DrawItemEventArgs)
Dim TextToDraw As String = _DefaultText
__Brush_Window.Color = Color.FromKnownColor(KnownColor.Window)

[code]....

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Access ComboBox Properties And Events When The ComboBox Is In A DataGridView?

May 2, 2012

DataGridView TIPs has TextBoxes and ComboBoxes in it and the data comes from an SQL table. I see how to get or set the cell values that come from the ComboBoxes using Item, but how do I access the actual ComboBox events and properties?

[Code]...

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Bind A ComboBox, To Show ID1 Through ID5 In The Combobox When My Form Loads

Sep 28, 2011

I have a table in my database with 5 columns (ID1 to ID5) and just one row. I'm trying to bind a comboBox, to show ID1 through ID5 in the combobox when my form loads. I have a dataset and tableAdapter's made for this already. I just want to know how to bind a combobox to those ID values.

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Combobox.items.add - Combobox To Have A List Of Choices From A Table In A Db

Jun 14, 2011

[Code]...

I'm making a combobox on a form. I want the combobox to have a list of choices from a table in a db. The two columns are a String and a Date. I want the date column to only show the year. I'm hoping I have the code right as it is above, but I'm not positive I've done the whole date thing right.

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Datagrid - Filter Combobox In A Datgrid Based On Another Combobox

Oct 19, 2010

I think my question is discriptive, or as Microsoft in the Documentation for Data Grid the question is, How do I have a combo box column display a sub set of data based upon the value of a different combo box column?

[Code]...

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Make The Combobox Go Back To The Original Text Of The Combobox?

Jun 19, 2009

I have a combobox..... When a user clicks on the list inside the combobox my webbrowser opens to the selected items website.how to make the combobox go back to the original text of the combobox?

Example: Combobox list
---- Select Item ----
Royals
Mets

[code]....

When the user see's the screen the ---- Select Item ---- is visible. When a user clicks a teams name it opens the teams website and the name stays in the box. I want it to go back to ---- Select Item ---- immediately after they click a list item.

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Update Source Combobox To Printer Combobox Selection?

Mar 27, 2011

Is there a way to update source combobox to printer combobox selection?So going from printer1 to printer2 the source will update according to what that printer has to offer.

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VS 2008 Combobox Properties - Make The Combobox Not To Be Able To Write Yourself?

May 13, 2009

I have completed my project and i have one remaining thing to settle... I want to make the combobox not to be able to write yourself. for example there are 4 options ,"A","b", "c","d".If i type w in the combo all the project is ruined!i want not to be able to type at all to prevent this...Which property should i change?

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Combobox - When Select A Value From The Combobox The Selection Won't Validate?

Feb 22, 2012

I'm having a problem with combo boxes. I usually use Java and it's been awhile since I used VB but I never remember having this much difficulty.My application is using an SDF file. From Data Sources, I drag the details on one of my Tables to my Form to get all of the fields. Three of them are comboboxes. Each of the three is an INT64 and each corresponds to a primary key in a different table. I click the tasks button on a combobox and for data source I select the appropriate table that has the data to go with the combobox, for display member I select the field that I want users to see, and for value member I select the primary key. Then I run a quick test and start the app, open the form, and add a new record. When I select a value from the combobox the selection won't validate because it doesn't think it's an INT64 like it should be. It seems to be using the display member as the actual value instead because if I change display member to the primary everything works great.

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ComboBox Auto-Search With String From ComboBox?

Sep 23, 2009

have build some code which goes through the datasource finding records on what a user types, basically if the user types 'P' in the combobox it finds all records from FieldName with 'P' and if you type 'Portugal' it finds all records from the FieldName with 'Portugal, it all narrows down the search list say if there are to entries which match 'Portugal' the combox would only have to items in.Theproblem i am have is that when i bound the datasource back to the combobox every letter you type stays at Postion 0 of the combobox anddoesn't move to the end of the letter asnormallythe combo works, does any one now how to get arround this problem.

At the moment i call my combobox search code from the keypress event of the combobox.This code works fine with recordsets in msaccess combobox but i cannot get it to work with the datasource of the combobox in vb.net Heres the code from the combobox keypress event:

Private Sub ComboBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles ComboSearch.KeyPress
Dim keyascii As Integer = AscW(e.KeyChar)
PhoneBookComboSearch(keyascii)
End Sub

Below is the code at the end of my keypress event send the datasource back to the combobox.

Dim adapter As New SqlClient.SqlDataAdapter(strSQL, conn)
Dim dt As New DataTable("MyTable")
Dim ds As New DataSet

[code]....

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Combobox Data Load Is Duplicating In The Combobox

Jun 5, 2011

Private Sub AddIngoing_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

[Code]...

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Combobox Readonly / Disallow Typing In Combobox

May 10, 2011

I need to give a user a drop down list of items to choose from, but I dont want them to be able to type in the combo box, any ideas?

[Code]...

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Combobox Value Disappears When Filling The Cascding Combobox?

Dec 15, 2011

I have cascading comboboxes and when I choose the value for the first one everything is fine. But when I try to choose the value for the second combo the value of the first disappears. However, the second combobox is populated with the appropriate values and then I have to choose again the value for the first one. This is the code:

For the fisrt Combobox
Dim PostcodeDA As New SqlDataAdapter()
Dim PostcodeTable As New DataTable

[code]....

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Datagridview Combobox Column Insrting Value Into The Combobox?

Dec 5, 2010

I would like to manually insert values in a combobox colum of a datagridview.I am using the DGV as an UNBOUND control.

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Fill A ComboBox On The Selection Change From Second ComboBox?

Jan 15, 2012

I have two comboBoxes, one is CountryCombo and second is StateCombo.What I want is the that when i the clicks country combo and select a one country then the States of that the country should get populated in the State Combo.I have tried things many many many but nothing working. Below is my code of how my CountryCombo is getting filled.

query="select CountryName from CountryMaster"
if dr.hasRows()
{[code]......

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Fill Another Combobox Depending On The Value Selected From First Combobox?

Aug 19, 2009

How to fill another combobox depending on the value selected from first combobox?

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Filter Combobox Contents By Text In Another Combobox

Jun 22, 2010

Brand new to VB 2008 Express, but have done some work in VB 6. Not sure what I'm missing, but here goes. I have two comboboxes linked to an Access 2007 database. One box lists the names of the States in the US.

This is what I used for the Table Adapter Configuration Wizard for the combobox "State" SELECT ST_UID, ST_NAME FROM STATE

For the combobox County I used: SELECT ST_UID, CTY_NAME FROM COUNTY ST_UID is an Integer.

I created a label with a bound value to STATE.ST_UID so that when a user selects the name of a state from the State box the appropriate ST_UID populates the label, (i.e, California has an ST_UID = 5).

The problem is when a state is selected, I only want the Counties for that state to appear in the County box, i.e, COUNTY.ST_UID = 5 if California is the selected state.

I then tried to convert the value in the st_uid label to an integer:

CODE:

This is what I last tried when again using the Table Adapter Configuration Wizard for the table that populates the County box: SELECT ST_UID, CNTY_NAME FROM COUNTY Where ST_UID = 'StUID' Order By st_uid, cnty_name

What I'm getting is a "Data type mismatch in criteria expression." I'm sure my error is something so simple.

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How To Make Combobox Control Like Combobox Column

Jan 21, 2010

i make this code to achive what i need[code]but in datagridviewwhat i make when i want to convert to use in dgv

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Remove An Entry From ComboBox When It Is Selected In Another ComboBox?

Nov 21, 2011

In my VB.net solution I have a form in which I have to choose a beginstation and an endstation. I have to select both from comboboxes. Now what I want is that when I choose a beginstation, the chosen station will be gone in the combobox of the endstation so that I can't pick the same endstation as the beginstation.Is there a way to do this? I've tried a lot with SQL and LINQ queries but it didn't work out :(

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Select A Particular Value On A Combobox By Looping Through Combobox Items?

Jan 5, 2012

I have a form in my vb.net application used to take the data about the returned stock. The form contains two comboboxes. One, named combobox5, contains invoice numbers and the other, named combobox3, contains party codes. Both the comboboxes are pre_loaded using sqldataadapter.

Now what i want is to change the party code in combobox3 when the invoice number is changed in combobox5. Elaborating it further, When Stock is issued the party code is stored along with the invoice number to keep track of to which party was the stock issued. Now when stock is returned i want to keep track that which party has returned the stock and i want that the party code should be automatically selected when the invoice number is changed and it should be what is stored in the database against that particular invoice number....

I'm using the following code for doing so:

Private Sub ComboBox5_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox5.SelectedIndexChanged
' defines a new connection to the database
Dim con As New SqlConnection("Data Source=TAHA;Initial Catalog=ADT;Integrated Security=True")

[Code].....

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Show/hide Another Combobox With Combobox Items?

Feb 3, 2012

i'm creating a simple search application which have a TEXT box and some combo boxes and radio buttons and a search button.radio button names "Videos", "Audios", "Pics" etc..when radiobutton of video is selected, a combobox is appear having options "DailyMotion", "Metacafe" etc I want that when i click "Metecafe" item in combobox of video, an other combo box appear having items Like "Entertainment", "How To", "+18" etc(categories of video search).

if combobox1.SelectedItem = "PAKISTAN" Then
combobox2.Visible = True
End if
if combobox1.SelectedItem = "INDIA" Then

[code]....

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Wpf - Populate ComboBox Based On Another ComboBox Using XAML?

Jul 29, 2011

I have two ComboBoxes

<ComboBox Name="cmbMake" DisplayMemberPath="MakeName" SelectedValuePath="MakeID"/>
<ComboBox Name="cmbModel" DisplayMemberPath="ModelName"/>

I use LINQ-to-Entities to populate the cmbGroup ComboBox

Dim db as myDataEntity
cmbGroup.ItemsSource = db.Makes

How do I populate my second ComboBox (cmbModels) based on the selection of the first ComboBox (cmbMake) using XAML so that whatever I select in the first ComboBox automatically filters the ItemsSource in the second ComboBox?

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Altering ComboBox Alters Second ComboBox As Well?

Apr 5, 2010

I have two Comboboxes which both have the same Datatable as source. These have the following code in their SelectedIndexChanged events:

[Code]...

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Populate Combobox From Selection Of Another Combobox?

Jan 1, 2012

I currently have a form with two comboxes. The first cbo is being populated with a project number, which is being pulled from the first column of a spreadsheet. I now want the second cbo to read the first cbo and then find that project number on the spreadsheet; when it finds that project number, I then need it to copy data from the row the project number is on. I have converted to vb from vba. Below is the code I used in vba (which obviously does not work). I only need certain cells from the project row.

Dim proj_num, rng As Range
Dim data, i As Long, j As Long
With Sheet1

[code].....

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Populating ComboBox That Is Connected To Another Combobox

Apr 15, 2012

Populating the combo box with the list of items from the one of the column in table from database.Based on the selection of item in the combo box, the another combobox should be populated with value corresponding to the selected item in the first combo box.[code]The problem with this code only the first row that is populate in the 2nd combo box.

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VS 2010 ComboBox Dependent On Another ComboBox

Aug 22, 2011

I am having issues when trying to populate a combobox that is dependent on another combobox. Populating the first combobox works as expected but attempting to set the value member or display member properties of the first combo box cause its selected index changed event to fire. That event seems to fire before the first combobox is fully loaded. The issue is then raised when trying to populate the second combo box, since it is dependent on having a valid value member to complete the dynamic sql statement, and at that point in time, there is no value member.

I can�t imagine that this is difficult but searching hasn�t yielded me any results. Should I be using a different event? What is the right way to do this?

I have a simple workaround in place - not allowing the second combo box to attempt to populate unless the first combobox has an index greater than zero but this hack is no good since it clearly prevents the user from selecting the first element in the first combo box.

Private Sub SpecialsForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim sql As String
Dim dt As New DataTable

[Code].....

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Feb 10, 2009

I am using .net 2008. I have placed a ComboBox on the form and I do not have an additem.

[Code]...

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Display The Text From Combobox Into The Textbox And Clear The Combobox Text When Click On The Button?

Feb 7, 2009

i wan to display the text from combobox into the textbox and clear the combobox text when click on the button.But when i select another text from the combobox and click the button, the textbox display and overwrite the previous text.How can i do so that when click, textbox display text from combobox and clear combobox text. Then click again, display the new text at 2nd line of the textbox without deleting the previous text?

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Combobox List Using Combobox.List =Array, Item Is Too Long?

Aug 19, 2011

I'm trying to create a Combobox List and I created the following my first try:

Private Sub ComboBox1_DropButtonClick()
ComboBox1.List = Array("LI-3:comparing and contrasting two or more print sources based on

[code].....

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Get A ComboBox To Remove The 6th String In The ComboBox Or An Index Of (5) But It Doesn't Remove It?

Feb 22, 2009

I'm trying to get a ComboBox to remove the 6th string in the ComboBox or an index of (5) but it doesn't remove it here is the function I am using:

if ComboBox1.items.count = 6 then
ComboBox1.Items.RemoveAt(5)
End If

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.net Combobox Different Style To C# Combobox?

Dec 17, 2009

When creating a combobox on the design surface of a VB.NET app in VS 2008 it is white and when creating it in C# it is gray.

How do I create a combobox in C# that looks just like the VB.NET one? (Style wise)

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Placing Value Member Of A Combobox In The Display Member Of Another Combobox

Jan 14, 2012

I have been battling with this problem for months with virtually no success. I am using Visual Studio 2008 Professional. The database is Microsoft SQL 2005.

I have two combo boxes - both bound to database tables. These are: Combo box 1 is for "VAT" and is bound to the VAT table. This table has 3 columns configured as shown below:

[Code]....

The commented out code was my pathetic attempt to put the Value member of one combo box into the display of the other. This obviously does not work and my web browser, when using Google, is full of purple headers showing the sites that I have visited looking for an answer.

When I have this working, I want to use the feature in a datagridview which may make a difference to how the problem is approached.

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Jan 27, 2011

I need to pull from an access database to populate a combobox. Then from there I need to have a second combo box populated depending on the selection in the first box. My thought of an example would be a website that is setup for selecting car make, modle,year...can that be done in VB?

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