update syntax error in vb.net

cmd.CommandText = "UPDATE master SET appl_no='" & Me.app_id.Text & _
                        ", c_name='" & Me.app_name.Text & "'" & _
                        ", h_f_m_name='" & Me.appfm_name.Text & "'" & _
                        " WHERE appl_no=" & Me.app_id.Tag
            cmd.ExecuteNonQuery()