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 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



Refresh Databound Combobox After New Data Is Imported?

Nov 20, 2011

ut 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:


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Nov 21, 2011

I'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.

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Feb 5, 2010

I 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:


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Feb 2, 2012

i 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...

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May 30, 2012

The 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...

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Oct 25, 2009

On the form load event i want to populate my ComboBox1 to display unique items directly from the DB. For that i have set the DataSource property of the ComboBox1 to the selected field. On the ComboBox1_SelectionChangeCommitted event i have set the filter for the DataSource which is working fine.

Now when i select an item from the ComboBox1 i get the filtered result in DataGridView but when i again drop down the combobox i see nothing other than the last selected item. Why is this happening? Is there a better way of populating ComboBox with the items directly from DB with default selected value as null?

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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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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?


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

Jun 14, 2011


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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VS 2005 Added A Few Items In Combobox Dropdown List At Form Load Event

Aug 7, 2009

I added a few items in the combobox dropdown list at the form load event. [code] At the runtime I dont want to allow the user to write something in the combobox as a text.The user can only select an item from the dropdown list of the combobox.

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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")


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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


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Add New Item To Databound Combobox

May 2, 2012

I 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]

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Dec 27, 2010

I 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()


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

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Jul 18, 2011

I 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.

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Databound Combobox Returning -1?

Sep 10, 2009

All 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


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Mar 17, 2011

I 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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Jan 9, 2011

With 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?

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Apr 4, 2012

How can I add data to databound combobox in vb 2005

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Apr 10, 2009

This is what I came up with:

Public Class IndexedDropDownItem
Private _KeyCode, _Display As String
Public Property KeyCode() As String


I want to be able to have the DisplayMember show "key_code - descript", while retaining the value I have set.

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Jan 11, 2010

been struggeling with this issue for quite some time now. I`ve got aan combobox on a detailform.


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Apr 20, 2009

On 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.

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Forms :: Add Item To Databound ComboBox?

Sep 7, 2009

I 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.

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Search All Items In A ComboBox Based On A Search Criteria?

Feb 8, 2012

I have three controls on my form; Textbox1, cboCity, lstCity When something (lets say "a") is entered in the TextBox1; I want to get each and every item in combobox cboCity that starts with "a" and add them to listbox lstCity.

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Oct 3, 2011

I have a databound ComboBox on my form. Is there any way that I can make the first field blank.

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Jun 9, 2008

I 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.

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Dec 1, 2010

I 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.
[Code] .....

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VS 2005 Selection Of Databound Combobox Is Locking?

Mar 23, 2011

here 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...

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Feb 24, 2010

I 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.

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Jul 15, 2010

is 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.

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Apr 5, 2010

I 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?

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May 8, 2009

I 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
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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.

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Feb 10, 2011

I've already found evidence of another having this problem. You can see this on this post by someone else:


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.

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Feb 3, 2012

I have combobox binded to binding source (NastavniciBindingSource). I wan't to refresh combobox when I add new data.

Dim str As String = InputBox("Enter name:")
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' here I need the code to refresh combobox

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Nov 15, 2011

I just had a question because I cannot seem to find the answers anywhere on the internet... also we are not upto this part in class yet.. Say I have 2 combo boxs... cmb1 and cmb2.. both are datasets from an access table.. how do I make it so cmb2 refreshes based on the value of cmb1? eg; if cmb1 is say, period 1, then i want cmb2 to only show results bases on items I have in period 1?

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I'm using VS2008, VB.Net and WinForms. I cannot get the combobox droplist to display the most recently added item unless I quit the app and restart. I've searched thru several forums for answers but cannot get any to work for me

Private Sub cboSpecialty1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles cboSpecialty1.KeyDown
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Feb 25, 2011

I have a form with a combobox that is filled with a list of parts from a mysql DB. But the table contains more then 1000 parts. So I decided to load only the first 20. then have 2 bottuns 1 for UP and one for Down. when the user wants to get next 20 he press Down Etc. I see that the data is retrived well from the DB. I use a stored procedure with parameters and test it outside the VB code. In the VB debug I also see that the combobox got loaded with the right data. But the drop down list continue to show the original 20 parts. I also have a code to see if I got to the top or to the end and display a message box. I got the message box display but still the drop down is showing the original 20 parts.

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