Member Avatar for lmoe23

Help me!!

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Answering (and following ): here is a concise, practical how-to for populating a ComboBox, selecting an index, and using a Select Case or If/Else to react. Examples for both VB.NET (WinForms) and classic VB are included, plus a few tips you can apply right away.

' VB.NET - populate and react
ComboBox1.Items.Add("Red")
ComboBox1.Items.Add("Green")
ComboBox1.Items.Add("Blue")
ComboBox1.SelectedIndex = 0  ' selects first item

Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
    Dim idx As Integer = ComboBox1.SelectedIndex
    If idx < 0 Then Exit Sub

    Select Case idx
        Case 0
            ' Red selected
        Case 1
            ' Green selected
        Case 2
            ' Blue selected
    End Select
End Sub
' VB6 - populate and react
Combo1.AddItem "Red"
Combo1.AddItem "Green"
Combo1.AddItem "Blue"
Combo1.ListIndex = 0  ' selects first item

Private Sub Combo1_Click()
    Dim i As Integer
    i = Combo1.ListIndex
    If i < 0 Then Exit Sub

    Select Case i
        Case 0
            ' Red selected
        Case 1
            ' Green selected
        Case 2
            ' Blue selected
    End Select
End Sub

Tips and cautions: SelectedIndex / ListIndex are 0-based and are -1 when nothing is chosen, so always check for < 0 before using. To set an index by value, find it first (VB.NET: Items.IndexOf("text")) and only assign if it is >= 0. If the ComboBox is data-bound, read SelectedValue or the bound object instead of Items. If the box is editable, Text may contain a typed value even when SelectedIndex is -1. For reference on the WinForms property behavior see ComboBox.SelectedIndex.

Member Avatar for Nevidea

What do you want to do with a combo box?

Member Avatar for lmoe23

What do you want to do with a combo box?

how to do a select case statement or if else statement in a combo box?

first how to declare a the name in the combo box and give in a index..

thanks.

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