Choose value in DropDown list on Edit command in GridView

I have a GridView bound to the dataset. When I click Edit button I have a drop down list bound to the different database table. Let's say in column 3 in normal mode I have Label that has value 3. When I switch to the edit mode I have the drop down in the column 3 with values 1,2,3,4,5. By default the dropdown will show the top value i.e. 1. If I click update even without selecting something in the drop down , the value of the label will be changed to 1.
Somehow when I switch to the edit mode I have to select the value in the drop down equal to the value that I have currently in the label.
I was trying the RowCommand event to enter the following code

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        If e.CommandName = "Edit" Then
            Dim index As Integer = GridView1.EditIndex
            Dim row As GridViewRow = GridView1.Rows(index)
            Dim dd As DropDownList = CType(row.Cells(3).FindControl("ddTAType"), DropDownList)
            dd.Text = ......
        End If
    End Sub

The problem is n the line
            Dim dd As DropDownList = CType(row.Cells(3).FindControl("ddTAType"), DropDownList)

dd comes up as Nothing and I cannot assin the value.

The same is in the  RowEditing event.

The code

        Dim index As Integer = GridView1.EditIndex
        Dim row As GridViewRow = GridView1.Rows(index)


        Dim dd As DropDownList = CType(row.Cells(3).FindControl("ddTAType"), DropDownList)

works fine in the RowUpdated event.

I need to enter value of the label to the dropdown list. Does somebody have any clue?
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