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Adding items to a drop down in VB.net

Posted on 2008-10-29
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Last Modified: 2012-05-05
Using vs 2008. On a web app I have 2 drop downs....

When a value in the first ddl is selected it autopostbacks and populates the 2nd ddl. This works fine

However I just want to add an item at the top of the 2nd ddl saying "please choose..." with the following code

DropDownList2.Items.Insert(0, "please choose...")

I have place this code in the DropDownList1_SelectedIndexChanged function......It compiles but doesnt work

Any ideas? Thx
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Question by:bdb12
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4 Comments
 
LVL 18

Accepted Solution

by:
David Robitaille earned 500 total points
ID: 22832946
i made it that way
make sure to set  AppendDataBoundItems="True" to the dropdown list

    Protected Sub DropDownListCategory_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
 
        Dim DropDownListCategory As DropDownList = CType(sender, DropDownList)
        Dim DropDownListSubCategory As DropDownList = CType(FormViewOption.FindControl("SubCategory"), DropDownList)
        DropDownListSubCategory.Items.Clear()
        DropDownListSubCategory.Items.Add(New ListItem("(Select a Sub-Category)", ""))
        DropDownListSubCategory.SelectedValue = ""
 
        If DropDownListCategory.SelectedValue = "" Then
            DropDownListSubCategory.Enabled = False
        Else
            CType(FormViewOption.FindControl("ObjectDataSourceSubCategory"), ObjectDataSource).Select()
            DropDownListSubCategory.DataBind()
            DropDownListSubCategory.Enabled = True
        End If
        
    End Sub

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Author Comment

by:bdb12
ID: 22833121
Ah I get it...thx

What do u mean u made it that way?
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LVL 18

Expert Comment

by:David Robitaille
ID: 22833155
probably my bad english...
I mean "I did it that way in a previous project"
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Author Comment

by:bdb12
ID: 22833194
Ah thx again
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