ASP.Net เขียนโค้ดปุ่มใน Event RowCommandแต่มีปัญหาเวลากดต้องกดสองครั้งถึงจะแสดงผล

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs) Handles Gridview1.RowCommand
        If e.CommandName = "addToCart" Then
            Dim row As GridViewRow = DirectCast(DirectCast(e.CommandSource, ImageButton).NamingContainer, GridViewRow)
            Dim lblstock As Label = CType(row.Cells(0).FindControl("lblstock"), Label)
            Dim lblfoodName As Label = CType(row.Cells(0).FindControl("lblfoodName"), Label)
            'Dim str_rkey As String = e.CommandArgument

            If lblstock.Text <= "0" And lblstock.Text <> String.Empty Then
                Messagetxt(lblfoodName.Text & "หมดค่ะ")
                'MsgBox(lblstock.ToString())
            Else
                'Dim dt As DataTable
                'If IsNothing(Session("Orders")) Then
                '    dt = New DataTable()
                '    dt.Columns.Add(New DataColumn("NO", GetType(Integer)))
                '    dt.Columns.Add(New DataColumn("rkey", GetType(Integer)))
                '    dt.Columns.Add(New DataColumn("foodName", GetType(String)))
                '    dt.Columns.Add(New DataColumn("storeName", GetType(String)))
                '    dt.Columns.Add(New DataColumn("option", GetType(String)))
                '    dt.Columns.Add(New DataColumn("QTY", GetType(Integer)))
                '    dt.Columns.Add(New DataColumn("unitPrice", GetType(Decimal)))
                '    dt.Columns.Add(New DataColumn("amount", GetType(Decimal)))
                '    dt.Columns.Add(New DataColumn("empID", GetType(String)))
                '    dt.Columns.Add(New DataColumn("name", GetType(String)))
                '    dt.Columns.Add(New DataColumn("empGrade", GetType(String)))
                '    dt.Columns.Add(New DataColumn("remain", GetType(Decimal)))
                '    Session("Orders") = dt
                'End If
                Messagetxt("บันทึกลงตะกร้าเรียบร้อย")
                'MsgBox(lblstock.ToString())
            End If
        End If
    End Sub