DetailsView ช่วยด้วยครับ textbox ไม่แสดงค่าในฐานข้อมุลครับ ไม่รู้ว่าเป็นที่อะไรครับ ลองหลายแบบ ก็ยังไม่หายครับ

    Sub myDetailsView_ModeChanging(sender As Object, e As DetailsViewModeEventArgs)
        Select Case e.NewMode
            Case DetailsViewMode.Edit
                myDetailsView.ChangeMode(DetailsViewMode.Edit)
            Case DetailsViewMode.ReadOnly
                myDetailsView.ChangeMode(DetailsViewMode.ReadOnly)
        End Select
        BindData()
    End Sub

        strsql = "UPDATE Student SET " & _
        " stu_name='" & txtname.Text & "', " & _
        " Surname='" & txtsurname.Text & "', " & _
        " birthday='" & txtbirthday.Text & "', " & _
        " age='" & txtage.Text & "', " & _
        " level='" & txtlevel.Text & "', " & _
        " nameschool='" & txtschool.Text & "', " & _
        " adddress='" & txtschool.Text & "', " & _
        " tel='" & txttel.Text & "', " & _
        " email='" & txtemail.Text & "', " & _
        " father='" & txtfather.Text & "', " & _
        " mather='" & txtmather.Text & "' " & _
        "WHERE id_dent=" & Request.QueryString("ID")