Getting the selection from dropdownlist

I'm trying to get the value of the selection from the databound dropdownlist to be displayed in a textbox. Please help.

I have set the Autopostback property to true.

However, the value that is displayed in the textbox is always the first value from the database or rather the selected value is always the first value of the dropdownlist.

Here is the VB code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDbDataAdapter1.Fill(DataSet11)
DropDownList1.DataBind()

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

End Sub

Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Dim str As String

str = DropDownList1.SelectedItem.Text

TextBox4.Text = str

End Sub
End Class

Please Help. Any assistance will be very much appreciated

Check for page postback in the sub load routine

VB Code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
    If ( Not IsPostBack)
         OleDbDataAdapter1.Fill(DataSet11) 
         DropDownList1.DataBind()  
    EndIf
End Sub

To expand further on that, the reason you are always getting the first value is because the page load event happens before other events are processed. Which means that you are reloading the combo box with values from the database and the selected index gets changed before the selectedindex event gets to process. So when the event actually fires, you will always get the first one.

Now, if you wrap code in a if statement that checks to see if the page is being posted back, then you can prevent the combobox resetting the data in itself when the page is posted back. Hence the reason DevGrp posted what he did.

It's working! Thanx so much!:D