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DropDownList
The DropDownList Web server control is same as the ListBox control but it
supports only single selection and displays items in a drop-down manner. The
class hierarchy for this control is as follows:
Object
Control
WebControl
ListControl
DropDownList
DropDownList Event
The default event of the drop-down list is the SelectedIndexChanged which
looks like this in code:
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object,_
ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
'Implementation Omitted
End Sub
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Notable property of the drop-down list is the Items property
with which we add items to the control. Like ListBoxes this control doesn't support
multiple selections.
DropDownList Sample
Drag a DropDownList, Button and a TextBox control on to the form. Add some items to
the DropDownList control using it's Item property. The following
code will display the item selected from the drop-down list in a textbox when the
button is clicked.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles Button1.Click
TextBox1.Text = "You Selected:" & DropDownList1.SelectedItem.Text
End Sub
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Live Code Demo
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