c# - Getting textbox's value in Nested gridview -


i have nested gridview, , there textbox named textboxdescription insert user information in second gridview. when want catch textbox's (textboxdescription) value return null.

html code:

            <asp:gridview id="gridview1" runat="server" autogeneratecolumns="false" width="100%"             datakeynames="reportid" onrowdatabound="gridview2_onrowdatabound" forecolor="#333333">             <alternatingrowstyle backcolor="white" forecolor="#284775" />             <columns>                 <asp:templatefield>                     <itemstyle width="35px" horizontalalign="center" />                     <itemtemplate>                         <img alt="" style="cursor: pointer" src="plus.png" />                         <asp:panel id="panel5" runat="server" style="display: none; text-align: center;">                             <asp:gridview id="gridview2" border="0" runat="server" datakeynames ="reportid" onrowcommand="gridview1_rowcommand"                                 style="direction: rtl" width="100%" height="100%">                                 <columns>                                     <asp:templatefield>                                         <itemtemplate>                                             <table width="100%" height="100%" bgcolor="#f4f4f4">                                                 <tr>                                                 </tr>                                                 <tr>                                                     <td style="width: 50%; height: 50%" hidefocus="hidefocus" unselectable="off" valign="top">                                                         <asp:panel id="panel3" runat="server" groupingtext="یاد داشت">                                                             <asp:textbox id="textboxdescription" runat="server" style="resize: none; width: 612px;                                                                 height: 160px;" text='<%# eval("userdescription") %>' textmode="multiline"></asp:textbox>                                                             <br />                                                             <br />                                                             <asp:linkbutton id="linkbuttonsave" commandname ="updatedata" commandargument='<%#eval("reportid") %>' runat="server">ذخیره</asp:linkbutton>                                                         </asp:panel>                                                     </td>                                                 </tr>                                             </table>                                         </itemtemplate>                                     </asp:templatefield>                                 </columns>                             </asp:gridview> . . .

c# code:

    protected void gridview1_rowcommand(object sender, gridviewcommandeventargs e) {     if (e.commandname == "updatedata")     {         int = convert.toint32(e.commandargument);         gridviewrow row = (gridviewrow)(((linkbutton)e.commandsource).namingcontainer);          textbox tb = (textbox)row.findcontrol("textboxdescription");         string text = tb.text;     } }

do below : 

gridviewrow row = (gridviewrow)(((linkbutton)e.commandsource).namingcontainer); int index = row.rowindex; textbox tb= (textbox )gridview1.rows[index].findcontrol("textboxdescription");

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