putting data to textbox

[kgenn]

hello. :)

I wnant to ask, how can I retrieve the data from gridview and put it on a textbox.
here's my sample code, but I was error

Protected Sub Gridview1_SelectedIndexChanged(ByVal sender As Object, ByVal e As GridViewSelectEventArgs)
        Dim row As GridViewRow = GridView1.SelectedRow
        Dim key As String = GridView1.SelectedDataKey.Value.ToString
        
        txtLName.Text = row.Cells(2).Text

        txtFName.Text = row.Cells(3).Text
        
    End Sub

please help me. :(