ASP.net Sort GridView by clicking on header

Hi

I am using the following code to populate a GridView in my ASP.net web page.
Is it possible to set up the GridView so that it sorts by a column when the header
of that column is clicked on?    

Sub Fill_GridView1(ByVal sSQL As String)

        Try
            ''Dim xSQLAdapter_Search As SqlDataAdapter
            ''Dim xSQLTable_Search As New DataTable
            xSQLTable.Clear()
            Dim cs As String = "Server=xxxxxxxxx.co.za;Database=xxxxxxxx"
            Dim connection As New SqlConnection(cs)
            xSQLAdapter = New SqlDataAdapter(sSQL, connection)
            xSQLAdapter.Fill(xSQLTable)
            Me.GridView1.DataSource = xSQLTable
            Me.GridView1.DataBind()

        Catch ex As Exception
            MsgBox(ex.Message & " 051h")
        End Try
    End Sub