asp.net - Text box inside a grid view not showing data -

i adding text box inside grid view.

when user clicks add button new text box created.

i getting data text boxes, when add data text boxes showing nothing

          private void setprevioustids(datatable dt)           {              if (viewstate["tidtable"] != null)                {                   if (dt.rows.count > 0)                   {                  (int = 0; < dt.rows.count; i++)             {                 textbox tid =  (textbox)gridview1.rows[i].cells[0].findcontrol("tid");                response.write(tid.text.tostring());                tid.text = "hello";// text not showing on text box             }          }      }  } 

aspx code here

    <asp:gridview id="gridview1" runat="server" visible="true">     <columns>         <asp:templatefield headertext="tid">             <itemtemplate>                 <asp:textbox id="tid" runat="server"></asp:textbox>             </itemtemplate>             <footertemplate>                 <asp:button id="buttonadd" runat="server" text="+" onclick="add_tid" />             </footertemplate>         </asp:templatefield>     </columns> </asp:gridview> 

you'll want this:

protected void gridview1_rowdatabound(object sender, gridviewroweventargs e) {     if (e.row.rowtype == datacontrolrowtype.datarow)     {         textbox mytextbox = (textbox)(e.row.cells[1].findcontrol("tid"));         mytextbox.text == "hello";     }  }