RadGrid, extracting KeyID of a row selected

function RowSelected(sender, args) {
                        var CRS = args.get_gridDataItem().get_dataItem()["CrsID"];
                        alert(CRS);
                    }
 
                            <telerik:RadGrid ID="courseContent" runat="server" Width="273" ItemStyle-Wrap="true"
                                  Height="300" AllowMultiRowSelection="true" AllowMultiRowEdit="true" gridlines="None"  OnRowDrop="courseContent_RowDrop" 
                                  Skin="WebBlue" OnNeedDataSource="courseContent_NeedDataSource" AllowAutomaticDeletes="true" OnDeleteCommand="courseContent_DeleteCommand">
                                <MasterTableView DataKeyNames="CrsID" CommandItemDisplay="None" HorizontalAlign="Center" 
                                  HeaderStyle-BorderWidth="0" ItemStyle-BorderWidth="0" FooterStyle-BorderWidth="0"  
                                  AutoGenerateColumns="False" Width="100%" BorderWidth="0">
                                    <Columns>
                                        <telerik:GridBoundColumn  UniqueName="CrsID" datafield="CrsID" Visible="false"></telerik:GridBoundColumn>
                                        <telerik:GridTemplateColumn HeaderStyle-Font-Size="8" HeaderText="Current Student Profile Contents" UniqueName="crsNumber">
                                            <ItemTemplate>
                                               <asp:Label ID="lblCourseNumber" ForeColor="#333333" Font-Names="arial" Font-Size="9"  Text='<%# Databinder.Eval(Container.DataItem,"crsnumber")%>'
                                                Width="225px" runat="server" BorderWidth="0">
                                               </asp:Label>
                                            </ItemTemplate>
                                        </telerik:GridTemplateColumn>
                                        <telerik:GridButtonColumn ButtonType="ImageButton" ImageUrl="../skins/webblue/grid/cancel.gif" 
                                            CommandName="Delete" ConfirmText="Are you sure you want to delete the selected row?">
                                        </telerik:GridButtonColumn>
                                    </Columns>
                                </MasterTableView>
                                 <ClientSettings AllowRowsDragDrop="True" >
                                    <Selecting AllowRowSelect="True" EnableDragToSelectRows="true"/>
                                    <ClientEvents OnRowSelected="RowSelected" />
                                </ClientSettings>
                           </telerik:RadGrid>

                                  

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