devexpress row selection

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ASP.NET

i have a grid view and i want to click to row and select button outside grid and display selected row data to text boxes so how to do and how to find which row is selected/clicked and how to pass data to select button.


My grid code is here.

<dx:ASPxGridView ID="ASPxGridViewAccountNoDetails" runat="server" AutoGenerateColumns="False"
                                DataSourceID="odsAccountNoDetails" Width="1061px"
                                KeyFieldName="MamAccountOpeningId"
                                onrowcommand="ASPxGridViewAccountNoDetails_RowCommand"
                                onrowinserted="ASPxGridViewAccountNoDetails_RowInserted"
                                onselectionchanged="ASPxGridViewAccountNoDetails_SelectionChanged">
                                <Columns>
                                    <dx:GridViewCommandColumn VisibleIndex="0">
                                    <ClearFilterButton Visible="True"></ClearFilterButton>
                                    </dx:GridViewCommandColumn>
                                    <dx:GridViewDataTextColumn Visible="false" FieldName="MamAccountOpeningId" VisibleIndex="1">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="AccountNo" VisibleIndex="2">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="DepositType" VisibleIndex="3">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="AccountType" VisibleIndex="4">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="InterestRate" VisibleIndex="5">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn Caption="A/C Opened On" FieldName="OpenedDate"
                                        VisibleIndex="6">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="MaturityDate" VisibleIndex="7">
                                    </dx:GridViewDataTextColumn>
                                    <dx:GridViewDataTextColumn FieldName="Status" VisibleIndex="8">
                                    </dx:GridViewDataTextColumn>

                                </Columns>
                                 <SettingsBehavior AllowFocusedRow="True" />
                                <Settings ShowTitlePanel="True" ShowFilterRow="True" ShowGroupPanel="True"></Settings>
                            </dx:ASPxGridView>

                            <asp:ObjectDataSource ID="odsAccountNoDetails" runat="server"
                                OldValuesParameterFormatString="original_{0}"
                                onobjectcreating="odsAccountNoDetails_ObjectCreating"
                                SelectMethod="GetByMemberRegistrationMemberId"
                                TypeName="CoSys.MemberAccountManagement.BLL.CMamAccountOpening">
                                <SelectParameters>
                                    <asp:ControlParameter ControlID="txtMemberId" Name="mamMemberRegistration"
                                        PropertyName="Text" Type="String" DefaultValue="-1" />
                                </SelectParameters>
                            </asp:ObjectDataSource>