Creating A Blank Entry In A Databound ComboBox?
Oct 3, 2011I have a databound ComboBox on my form. Is there any way that I can make the first field blank.
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Adding A Blank To A Databound Combo In A DataGridView
Apr 27, 2010I've inherited a form that has a DataGridView that is bound to a dataadapter and it is connected to a binding source. Within the DataGridView is a combo box that is bound to its own bindingsource which basically just calls a stored proc to bring back the possible values for the dropdown combo control
With a blank new row and sometimes even with an existing row, this value for the combo box can be NULL which is a legitimate value for it if no value selected. Problem is everything is so tightly bound if the user mistakinly clicks the dropdown then a value is populated and there's no way to get back to NULL
I've tried to catch the mousecelldown event and others to try to catch this before a value is selected but the Cancel=True doesn't work - I can catch the event but don't know how to return the cell to unclicked or reset it to NULL or pre selected value if NULL I know how to at a new row with the datatable and then set the combo datasource to it and I have my null blank value but with a tightly bound control how do I add this row?
VS 2008 DateTimePicker To Be Blank If DATABOUND Date Field Is Null?
May 4, 2009How can I get this to happen? I googled around and it seems setting the CUSTOM FORMAT to " " when the field is null will work but not for a BOUND datetimepicker.
View 12 RepliesDynamicaly Refresh Databound Combobox Items Based On Selected_index_changed Event Of Another Combobox?
Jan 27, 2010I 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 a public variable in the where clause to fetch the correct results. I ll put some code here to clarify it a bit more.Public Class Frm_inv
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Remove An Entry From ComboBox When It Is Selected In Another ComboBox?
Nov 21, 2011In 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 :(
View 1 RepliesAdd New Item To Databound Combobox
May 2, 2012I have a combobox that is bound to a dataset (via datatable and datatableAdapter). The combobox displays the current data in the table as it should.I have programmatically added the string "ADD..." to the list at the form.shown event:[code]when the user then click on (select) "ADD...", i open a new form to allow the user to add a new item to the list.The code i have behind the "ACCEPT" button on the new form stores the NEW value to the DATASET. I have verified this by previewing the data in the dataset.My problem is getting the combobox to reflect the changes to datatable to which it is bound.[code]
View 7 RepliesCannot Re-Bind Databound ComboBox
Dec 27, 2010I have cascading data-bound combo boxes, however, if the second of the two boxes does not have the value, I am trying to change the data source of the original process to the default selection.
However I am getting errors no matter what I try to do to get the combo box to clear.
cboSubSystem.SelectedIndex = -1
cboSubSystem.DataSource = Nothing
Call cboSubSystem.Items.Clear()
[Code]....
Currently: "Items collection cannot be modified when the DataSource property is set." at the Items.Clear If I try to remove the clear, I get "Cannot bind to the new value member. Parameter name: value" at the valuemember set
Databound Combobox And Autocomplete?
Jul 18, 2011I have a combox that is run-time bound to a table that is run-time built and populated from a text file. I have set the combobox autocomplete mode to suggest and the source to list items, but only the 1st item will work. Ok so here's the code:
Private Sub SetStateComboBox()
'set autocomplete for combobox
state_cmbx.AutoCompleteMode = AutoCompleteMode.SuggestAppend[code]....
The file is a text file with a list of the 50 states and their abbreviations in the format : stateName - abbr.Now what happens is the data is displayed correctly, but when I begin to type a letter for the autocomplete the only letter that shows anything is the "a" and it will only show the very first item in the text file.Everything else does not display with the autocomplete, but does show in the list. I have tried variations such as adding the data as items like this:
Private Sub SetStateComboBox()
'set autocomplete for combobox
state_cmbx.AutoCompleteMode = AutoCompleteMode.SuggestAppend[code]....
This way does not allow any autocomplete when I begin typing but everything is in the list. I've also tried converting the table to a customautocompletestring and still the same results.The only way that I have been able to get it to work is be entering each state as an item: state_cmbx.items.add("Michigan - MI"), then it works correctly.Also the combobox dropdownstyle is set to dropdown, and I'm using visual studio 2010 ultimate and coding using VB.
Databound Combobox Returning -1?
Sep 10, 2009All I want is to enter text into a databound combo box. If the entry is not in the list, then the user should have the option of updating the table that the combo box is bound to.The way I have set up the project is by dragging objects from the toolbox and having the application set up the datasource through the data sources tab. This in turn creates the bindingsource, dataset and tableadapter.For updating the combobox I have added code into the leave event. This does indeed update the client table as required. However, the id stored in the quotes table is -1. How do I make sure that the correct id is stored that references the newly added client record. For your information, the client table only has an id and clientname column.
The code is as follows:
[CODE] Private Sub ClientComboBox_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClientComboBox.Leave
Dim con As New OleDb.OleDbConnection
Dim dsClients As New DataSet
[code]....
Select Value On A Databound Combobox?
Mar 17, 2011I have a ComboBox that's been bound to a DataView that's taken a filled DataTable. This DataTable has three columns. Before the DataView is bound to the ComboBox I add another column and set some values.
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Wpf - Using A Databound Combobox On A Datagrid?
Jan 9, 2011With a datagrid, I want to use a databound combobox to set the value of a property with the combobox's selected value. How would I go about doing that?
View 1 RepliesAdd Data To Databound Combobox In VB2005?
Apr 4, 2012How can I add data to databound combobox in vb 2005
View 1 RepliesCustomize The DisplayMember Of A DataBound ComboBox?
Apr 10, 2009This is what I came up with:
Public Class IndexedDropDownItem
Private _KeyCode, _Display As String
Public Property KeyCode() As String
[Code].....
I want to be able to have the DisplayMember show "key_code - descript", while retaining the value I have set.
Databound Combobox Cannot Lose Focus
Jan 11, 2010been struggeling with this issue for quite some time now. I`ve got aan combobox on a detailform.
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Databound Combobox Selection Retention
Apr 20, 2009On my form I have three fields and a datagrid view.One field is a combo box.All fields are databound.The datagridview is a detail grid, bound in the "normal" way. Scrolling through records, etc., all work fine.What doesn't work is when a selection is made using the combo box.The underlying table has a self-join of one-to-many: ParentID, ChildID. ChildID is the main ID for the underlying table.Children may have a parent This is just by way of example.So, the combo box's Value is bound to ChildID, and the SelectedValue is bound to the ParentID.On the form one chooses the Parent with this combo box.When I test this arrangement, I select a Parent, then click Save (using the default toolbar actions). However, the combobox seems to "reset" the selection to the first in the list.
View 1 RepliesForms :: Add Item To Databound ComboBox?
Sep 7, 2009I started a Windows app using all code for database connection and validation. However, it was always losing the formatting that I had set at run time. So I thought I would use the long tedious process of using all of the studios objects with minimum code.
I am now at the position where I am mostly happy with the layout and how this operates. However, I want to be able to add a non-databound value to a databound combo box. I have set the properties for the combo box in the combo box tasks.
Also, I want to add the ability for the user to update that table that is bound to this control, when a value is not in the list. I know that there is a NotInList event in Access, but I can not find it in VB.Net. I did get so far with updating from the combo box using the Leave event. However, when the database was updated the control could not find the ID in the Clients table to save to the Quotes table.
Databound ComboBox Not Displaying Items Correctly
May 30, 2012The Combo-box only has three items (Top View, From South looking North, From West looking East). Bound data from an Access Query called qryViewsFilteredByJob. I'm using it to pass a parameter to the filter for a binding source on a second query called qryAllSections2 (I don't think that's important though.)
When the form loads up it displays correctly stating on 'Top View', and I can click another other item just fine. When I pick another item, however, the first item, 'Top View', disappears and it replaced by whatever item I just clicked. So if I clicked 'From South looking North', the three item choices are now 'From South looking North', 'From West looking East', and 'From South looking North' again...
Refresh Databound Combobox After New Data Is Imported?
Nov 20, 2011ut refreshing a databound Combobox After New Data in Imported into the Database. As it seems not be updating Without Closing the Form Thus resetting the Binding Source. but how can i do this on the Fly Lets say on the Combobox is Clicked it dose the updated List?
Its starting to be Quite Irritating That it is dosen't seem to be affected by:
ComboBox1.ResetText()
ComboBox1.Refresh()
[code].....
Refreshing Databound ComboBox Values On Form
Jun 9, 2008I have a databound combobox that displays a list of items, and I have a windows form that opens after clicking a button that allows me to make changes to the table that the combobox gets it's values from. When I make the changes and save them (successfully) and return to the parent window, the changes aren't reflected in the combobox. If I exit the app and launch it again the changes are reflected perfectly. I've tried me.combobox.refresh() on the forms GotFocus event, but no luck.
View 3 RepliesSql - Refresh/update Databound ComboBox Immediately?
Nov 21, 2011I've made a windows form in which I can change names in my databasetable 'stations'. To select which station to change I've used a databound ComboBox which gets all stations from the database table.
Now when I change the name of a station I want to get it immediatly updated in my combobox without restarting the application.
Take Orders - Populate Textbox From Databound ComboBox
Dec 1, 2010I got a pizza shop and the assingment is to create a application which allows the user to take a customer's order... I have a combo box filled with all of the items you can order (data from an access file)... and I need to have it so that when you select an item, it shows up in a text box below... I keep getting an error message saying you can't convert datarowview to string..
Here is some
Private Sub TakeOrders_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'PROJECT4DataSet.Items' table. You can move, or remove it, as needed.
Me.ItemsTableAdapter.Fill(Me.PROJECT4DataSet.Items)
[Code] .....
VS 2005 Selection Of Databound Combobox Is Locking?
Mar 23, 2011here is the situation i am using the combobox with the databound dataset..i produce two combobox for that one field because i need to display the selected data in separate tabs... the combobox 1 is working perfectly i can select all data i want to but in the combobox 2 i can only see those data and when i select data on it, it will not display the selected data.. it still remain on the previous displayed data...
View 8 RepliesVS 2008 Databound Combobox Auto-drop Down?
Feb 24, 2010I have an application working great that has a data-bound combo box.My question is When the user types in box the results are not shown unles I manually click the drop down arrow.
View 2 RepliesVS 2008 Refresh Contents Of Databound Combobox?
Feb 5, 2010I have a combo box that's filled from a query in the database. If I add a field to the database, the new field won't show up in the form until I close it and reopen it.
So, how do I refresh the contents of that combo box?
I bound the data onto the combo box like this:
[Code]...
Call To Validate The Text Entered In To A Databound Combobox?
Jul 15, 2010is there a flag i can call to validate the text entered in to a databound combobox?
My situation is that i have a combobox where users can type in whatever they like, but OnLeave i'd like to ensure the value in the combobox is one of the items in the data that its bound to.
i'm avoiding a listbox because the suggest/append creates a nicer interface while they are typing as it shows possible matches.
Databound ComboBox Need To Force Update In Datasource When Selection Changes
Apr 5, 2010I have a combobox where the SelectedValue on the combo is bound to a property on a business object.Everything works fine, but the property that's bound to the SelectedValue on the combo only gets updated when the focus leaves the control. I understand that the property doesn't get updated until the control is validated (loses focus), but I need it to update the datasource as soon as the dropdown is closed.I know I could probably leave focus from the control on the DropDownClosed event but I'd prefer something a little less kludgy.What's the best way to immediately update my datasource when the dropdown is closed?
View 2 RepliesAn Array Of Objects - An Entry Will Be Stored In Serialports(4), All Other Array Elements Will Be Blank?
Jun 1, 2009I've come up with the following and it's partly working.
Public serial1, serial2, serial3, serial4, serial5 As SerialPort
Public serialports() As Object = New Object() {serial1, serial2, serial3, serial4, serial5}
dComPort = "COM4"[code]....
The above code works fine! But im having trouble trying to now retreive whats stored in the array.In the above example, an entry will be stored in serialports(4), all other array elements will be blank.If I do this it works.
MsgBox(serialports(4).PortName) ' this retuns the value COM4
But I'd like to loop though all array elements and print out ALL the PortNames, The below code doesnt work, I get an error Object variable or With block variable not set.
For i = 0 To serialports.Length - 1
MsgBox(serialports(i).portname)
Next
VS 2008 - Change Individual Item Color In DataBound ComboBox
May 8, 2009I have a combobox called cbMaterialType on a windows form that's bound to a table in SQL - everything loads great and the combobox displays 'Material' items as it should, in that table I have two fields - Material (as mentioned above) which is a char(25) and InStock which is an nchar(1). If the InStock field contains a '1', I'd like the individual material to be green in the combobox, if '0', then red. I have the simple code in the drawitem event of the combobox as follows, but can't seem to get any results at all:
Private Sub cbMaterialType_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles cbMaterialType.DrawItem
If MaterialTableAdapter1.GetData.Item(cbMaterialType.SelectedIndex).InStock = 1 Then
cbMaterialType.ForeColor = System.Drawing.Color.Green
Else
cbMaterialType.ForeColor = System.Drawing.Color.Red
End If
End Sub
I've never worked with any form of color in comboboxes before and this is my first attempt at the drawitem event.
.net - Delete From Access Database Based On Selected Item In Databound Combobox
Feb 2, 2012i have a databound combobox using VB2010 and MS access as the DB.. When i click on a button, the selected item in the combobox will be deleted from the database and no longer display in the combobox...
View 1 RepliesDatabound Combobox Doesn't Update Properly Depending On Input Meth
Feb 10, 2011I've already found evidence of another having this problem. You can see this on this post by someone else:
http:groups.google...096b3fcaa?pli=1
The problem is that when one navigates the combobox via the keyboard, the combobox's information doesn't update. If you click a value with your mouse, though, everything works wonderfully. The link I've mentioned suggests changing the binding from the Text property to the SelectedItem property. I'm very deep into this project and it would be a bit of a nuisance to change the setup so as to allow it to be bound to the SelectedItem property.What I'm wondering is whether or not I can detect the user changing the selected entry in the combobox and tell VB that they "clicked" the value, if that makes any sense.