c# - Merge duplicate values from a gridview in asp.net -

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i have 2 gridview's in page (gridview inside gridview) in main gridview want merge duplicate values of first cells. binding both gridview @ runtime. please help

aspx:

<asp:gridview id="maingridview" runat="server" autogeneratecolumns="true" showfooter="true"          skinid="gridviewmast" emptydatatext="no records found." rowstyle-wrap="true"         alternatingrowstyle-wrap="true" cellpadding="6" onrowdatabound="maingridview_rowdatabound"         onrowcreated="maingridview_rowcreated">     <columns>         <asp:templatefield headertext="action item" itemstyle-horizontalalign="left" itemstyle-wrap="false">             <itemtemplate>                 <asp:gridview id="grditemnested" runat="server" allowpaging="true">                     <columns>                      </columns>                     <headerstyle backcolor="#5d7b9d" forecolor="white" height="30px" font-bold="true" />                     <rowstyle height="20px" backcolor="#ffffff" forecolor="#000000" />                     <alternatingrowstyle backcolor="#d3d3d3" forecolor="#000000" />                     <footerstyle backcolor="#5d7b9d" forecolor="white" height="30px" font-bold="true" />                 </asp:gridview>             </itemtemplate>             <itemstyle horizontalalign="center" verticalalign="top"></itemstyle>         </asp:templatefield>     </columns>     <emptydatarowstyle height="25px" font-bold="true" />     <rowstyle height="20px" />     <pagerstyle height="30px" />     <headerstyle height="30px" font-bold="true" />     <footerstyle height="30px" font-bold="true" /> </asp:gridview>

am using ondatabound event achieve when running application first record merge in gridview , alignment not proper of main gridview. can please me rectify missing here.

.cs

protected void maingridview_databound1(object sender, eventargs e) {     (int rowindex = maingridview.rows.count - 2;                                        rowindex >= 0; rowindex--)     {         gridviewrow gvrow = maingridview.rows[rowindex];         gridviewrow gvpreviousrow = maingridview.rows[rowindex + 1];         (int cellcount = 0; cellcount < gvrow.cells.count;                                                       cellcount++)         {             if (gvrow.cells[cellcount].text ==                                    gvpreviousrow.cells[cellcount].text)             {                 if (gvpreviousrow.cells[cellcount].rowspan < 2)                 {                     gvrow.cells[cellcount].rowspan = 2;                 }                 else                 {                     gvrow.cells[cellcount].rowspan =                         gvpreviousrow.cells[cellcount].rowspan + 1;                 }                 gvpreviousrow.cells[cellcount].visible = false;             }         }     } }


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