Forms :: RowSource In .NET Comboboxes?
Sep 1, 2011
I have been setting DataSource for a series of combo boxes to the same table as they all display the same options. However, when I ran the project, any change in any one combo box makes all the others 'flip' to the same selected value. This is obviously wrong.
In Access, you have 'Control Source' which is the db field that is bound to the combo box and 'Row Source' can be a query or whatnot that several combo boxes can run 'independently'.Is there an equivalent option in VB.NET? I DO NOT want to manually enter the exact same options many times as that is hard to maintain, to say the least.
Just to repeat: it is not going to work to say DataSource = Row Source. if two combo boxes are set to the same data source, a selection in one automatically makes the other one select the same value. unless, of course, i am missing something.
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Aug 12, 2009
Trying to set a Combo Box RowSource to a field in a table that contains the choices separated by semi colons. Have tried both a query and a DLookup but it results in displaying the full contents of the table field, e.g. "10;12;14;16" rather than giving me the usual selection list
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May 5, 2009
I have three comboboxes in a form. The first is the parent of the second, which is the parent of the third. When they are all updated, a datagridview should be updated.
The problem is that the user can choose to change the value of either combobox, so I don't know which combobox's value is being changed. Therefore I now update the datagridview from the third combobox's selectedvaluechanged event. This unfortunately means that if the first combobox is changed, the second and third comboboxes selectedvalue events must trigger. As a consequence, when the first combobox is changed, the datagridview is being updated about six times (which doesn't work for me performancewise).
What I'd like to do is to call the updatedatagridview sub from either one of the three comboboxes, but only if the user has chosen to change that specific combobox's value (that is, get the form to only update the datagridview when the selectedvalues of all three comboboxes have been set).
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Jun 16, 2011
so yesterday this code was working for my userforms and today its not. Its a simple clear command for textboxes and comboboxes. what is from here?
Dim ctl As Control
ForEach ctl In Controls
IfTypeOf ctl Is TextBox Then ctl.Text = ""
IfTypeOf ctl Is ComboBox Then ctl.Text = ""
Next ctl
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Feb 12, 2010
How I can populate a combobox (combobox2) based on the selection made from another combobox (combobox1)? They are on different forms. Combobox1 lists locations, while combobox2 lists offices for each location. I would like it to work so that when the user clicks on combobox1 and makes a selection, the 2nd form loads with combobox2 showing all the offices for the selected location.
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Nov 1, 2010
I'm trying to detect when the tab key was pressed and intercept it in certain cases. Since the form I'm working with has many fields, I've tried overriding ProcessTabKey so that I don't have a separate sub for each control. However, I've found that after adding a simple ProcessTabKey method, each time I press tab it skips one of the combo boxes. In order to duplicate the situation, using Visual Basic Express 2008, create a new Windows Forms project and add 5 combo boxes to the form - allowing each to automatically get an incrementing TabIndex.
Then add the following code the form:
Public Class Form1
Protected Overrides Function ProcessTabKey(ByVal forward As Boolean) As Boolean
MyBase.ProcessTabKey(forward)
End Function
End Class
Now when you run the project, you'll see that each time you press tab it skips one of the combos.
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May 12, 2009
I have a windows form on which there is a textbox and a command button. When user inputs an integer in the textbox and clicks on the button, the userform grows and adds that many number of comboboxes and textboxes in a panel.
how to add variable number of comboboxes and textboxes at run time.
The maximum value of that integer would be 10.
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Apr 24, 2012
this is a subset of a previously posted problem, I have narrowed down my issue and am reposting a question from this thread: [URL] I have apparently confused the compiler by renaming some comboboxes in Visual Basic .net express? (See relevant code below) I think the confusion is in who should handle what, with two routines named with variations of ComboBox1 and one handling the other ( it confuses me just trying to interpret it mentally):
[Code]...
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Oct 28, 2011
I have a form with 4 comboboxes and a button. The first combobox is enabled, but the rest of the controls are disabled. When the form is opened I fill the first combobox (cbxMethod) with a datatable. When the user selects something in cbxMethod the next combobox (cbxStudy) will be filled and so on. When the last combobox (cbxAnalyte) has a selected value I want to enable the button and give it focus so the user can move forward with the program. I basically want to force the user to move from one combobox to the other, until all are filled.I am currently using the SelectionValueChange event, but this event only fires when the user changes the value with their mouse or hits the Enter key, not when the user hits the Tab key.
Public Class frmCalculatedAnalyte
Private cv_dt As New DataTable
Public Sub New()
[code]....
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May 13, 2009
I have 5 combo boxes all connected to a database by datasets.
The user should be able to select different items but for some reason when one combobox item is selected, the same item becomes selected for every combobox.
I haven't coded anything regarding the cbx's so why is it doing this?
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Jun 21, 2010
I have two comboboxes the first one is for order #, the second one is for the amount of order payments, there could be 1, 2, 3... payments for this order. I would like to get all payments to show in the second combobox that relate to the order # selected in the first, process that payment by changing other values in other textbox's. Then have that payment psoted as processed back to the DB table. I have a binding satament, but it pulls all payments, and not just per order. How can I get this to select just by order #?
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Feb 12, 2010
I have this code that adds items in 2 comboboxes: The first code works fine as it adds the dates into the comboxes
Dim myConnection As OleDbConnection = New OleDbConnection
Dim myCommand As OleDbCommand = New OleDbCommand
Dim myDataReader As OleDbDataReader
myConnection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|Network_Info.mdb"
[Code] .....
But when I try to add items by month I always get this error in these lines:
ComboBox2.Items.Add(myDataReader("DateRecorded"))
ComboBox3.Items.Add(myDataReader("DateRecorded"))
It says: IndexOutOfRangeException was unhandled
[Code] .....
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Oct 27, 2010
I have a project in which the comboboxes above the code window, below the tabs have disappeared. If I open and close the project, they do not appear. If I open another project, they do appear. As soon as a open the project where they do not appear, they disappear.
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Feb 8, 2011
I have: [code] So, when I select something from cmbx1 it selected in cmbx2. How does it works?Do I need a copy of dt for second combobox to get independed but same values?
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Mar 15, 2012
My problem in the Combo Box and SQL query .. I have three comboboxes linked to an Access 2007 database
[Code]...
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May 10, 2012
I've been working on a VB project where I use a 1st drop down list to select a movie category and then in the 2nd drop menu, movies from that category will be displayed. The movies are stored in a 2-dimensional array by category. I've been able to edit my array but I'm having problems with my .AddRange() function. What would I have to put in those parentheses for the list (for each category) to appear in my 2nd combobox when the category is selected?
[code]...
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Jun 21, 2010
I bind the two comboboxes with table. One combo contains product and another contains subproduct. When I clicked first combobox then subproduct of that is filtered in another combo. When I clicked next,previous, it is working properly. But when I go to last record second combo is refreshed means it is not showing proper subproduct. Given the code on 1st combo_selectedIndexChanged. When I go to last record the SelectedIndexChanged event occur.thats why it is not show me last record proper.
Private Sub frmType_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
cmd = New SqlCommand("select makeName from Make where status='Add' or status='Edit'")
dt1 = New DataTable
dt1 = ob.getDataTable(cmd)
cmbMakeName.DataSource = dt1
[Code] ......
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Sep 11, 2010
i have a datagridview with a column with comboboxes. My problem is that the changes that i am doing from comboboxes didn't occur to datagridview immediately but after the user click to another cell.
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May 27, 2009
I have a combo box on a form, it has a large number of values in it (about 40000). When the combo box populates it flickers from invisible to visible for about a second.After investigating this I am sure that it is not the call to the database that is causing this but when the combo is drawn.
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May 12, 2012
I need the comboBox to show the data from dataTable but i don't know how to do it. To do that we need to make relationship or what? Like posted another day.
1-Column No.
2-Column Type = mp3, wav, ogg
3-Column CompanyName = CompanyName
4-Column Volt = Volt
How it work when select type for example : mp3 and column companyname it show the volt we have added. the same when we choose mp3 and another companyname it show the volt of that company.
Because i need to know which companyname show the update of their volt.
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Jan 16, 2012
I use VB 2010 Express My problem is:I have two comboboxes one button and one textbox.So what I am trying to do is.Add company names Like EA Games and lets say product name is Crysis.and I want it to show the barcode number of the product n P.I.D?
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Jun 9, 2011
I have a form with two comboboxes ,one text box and a button .I have multiple tables in ms access database with same structure , col1 and col2 .I want to insert text box value into column1 in the table selected from combobox1 and into column2 in table selected from combobox2 such as if i select table1 from combobox1 and table2 from combobox2 and click on the button, data should be inserted into both table1 and table2.when i run the code it , i dont get any error but it does not load the tables in comboboxes
Imports System.Data.OleDb
Partial Public Class Form1
Inherits Form
[code]....
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Feb 11, 2012
unfortunately searching the web i cannot find a decent example that allows me to loop through a winform to make sure comboboxes items are selected.basically what i would like to do is check the form if the comboboxes have been selected if not then highlight them yellow and set the focus on them.
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Feb 6, 2010
I would like too generate a number of comboboxes at runtime and then pass them to a Sub, like this:[code]What is the correct syntax to use to pass the comboboxes collection to the Sub?
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Aug 11, 2009
I have the following class. Basically, i want to populate a bunch of comboboxes. So i want to return an Id and description column almost all the time.
Public Class combodata
Private _id As Long
Private _description As String
[Code]....
how can I return the items as an array. Is converting to an array the best way? I will need to populate a combobox with the returned result
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Apr 2, 2009
I have a vb.net window app that has a number of combo boxes on it. These are being populated from a number of XML files and all this works like a charm. The problem i have is when it comes to putting the comboboxes in a datagridview. I have set up my columns and have set the first column to be a combobox but i'm having problems referencing this so that i can set the datasource to populate it.
I've looked everywhere but cant seem to find how to reference this control. Once this has been selected it will populate a second combo box based on the data from the first. I think i can sort this out, if i could only work out how to set the datasource of the first combo programatically.
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Apr 21, 2012
I'm working on a college VB project using an 2D array with 2 combo boxes. One combo box selects a size and the other selects a style. I have everything working correctly with calculations except I need each combo box to pop up a message box if the user doesn't make a selection in a combo box. It will pop up for one combo box, but not the other. My question is how do I get the program to pop up a message box for each combo box independently? Should I use Try/Catch or would another method work better? (I'm using VB Studio 2010)
Private Sub CalculateToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CalculateToolStripMenuItem.Click
'Retrieve price of selection.
[Code].....
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Jul 22, 2010
I have two relayed tables (teams and players) and two datagridviews. In the datagridview1 i have a combobox with datasource <teams>.In datagridview2 i have a combobox with datasource <players>. In this combo i can see all players. I want to filter and see only the players related to the team of the combo in the datagridview1.
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Dec 1, 2011
What I want to do is use two drop down comboxes (Comboboxes 1 & 2)in tandem in a databound datagridview.Both comboboxes are bound to tables in an SQL 2005 database.By this I mean select an item in combobox 1 and have its display member appear in that combobox.This is usually text.The value member for combobox 1 to be displayed in the combobox 2 which is also text.The value member from combobox 1 has identical values to the display member of combobox 2 in the database tables.If I need to change the display member in combobox 2, as all situations have their exceptions, I want to do this without changing combobox 1.The value member for combobox 2 is numeric and is put into another cell in the DGV for carrying out calculations.I have managed to get the display of combobox 1 working on its own and ignoring the value member.I have done the same with combobox 2 and have the value member working correctly.
Can databound comboboxes be used in this manner or will VB.net not allow this type of operation.I have not done this with any code. I tried to get my required operation through the edit facility in the DGV.When attempting to run the program, it does not compile and throws an error which basically says "You have done something wrong.Sort it out."Typical Microsoft help! Can it be done using code in the datasets or binding sources?
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Apr 20, 2010
I use single column datatables in combination with the .DisplayMember and .DataSource property to populate comboboxes. Data for these datatables I get from a MySQL database. All this is working fine, but I noticed some behavior for which I can't find an explanation, and am not sure of if it can be prevented somehow.Some of the datatables are used for different comboboxes on different tabs. The behavior found is that with comboboxes that have the same datatable as datasource. If I select an item in 1 combobox, the others automatically select the same item.
-Is this normal, because I couldn't find any documentation on this behavior?
-Can it be prevented, and if so how?
I could use a for next loop and manually add each item to the combobox, but using .DataSource is so much cleaner and more efficient.
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