dynamic - Getting the values of a dynamically created control inside Telerik:RadGrid -

i have telerik radgrid adding columns dynamically on click of button. code follows :

 private void addcolumns()     {         try         {             datatable dtparmaintenancelistheaderdata = (datatable)session["parmaintenancelistheaderdata"];             foreach (datacolumn dc in dtparmaintenancelistheaderdata.columns)             {                 dc.readonly = false;             }             if (!dtparmaintenancelistheaderdata.columns.contains("parcombodatafield"))                 dtparmaintenancelistheaderdata.columns.add("parcombodatafield", typeof(string));             dtparmaintenancelistheaderdata.acceptchanges();             foreach (datarow dreachrow in dtparmaintenancelistheaderdata.rows)             {                 string cuscombo = dreachrow["cusfstnam"].tostring() + " - " + dreachrow["cuslstnam"].tostring();                 string parcombo = dreachrow["parcod"].tostring() + " - " + dreachrow["pardsc"].tostring();                 dreachrow["parcombodatafield"] = cuscombo + " " + parcombo;                 gridtemplatecolumn templatecolumn = new gridtemplatecolumn();                 string templatecolumnname = cuscombo + " - " + parcombo;                 templatecolumn.itemtemplate = new radgridtemplate(templatecolumnname);                 templatecolumn.headertext = templatecolumnname;                 templatecolumn.datafield = "parqty";                 templatecolumn.headerstyle.horizontalalign = horizontalalign.center;                 templatecolumn.itemstyle.horizontalalign = horizontalalign.center;                 templatecolumn.headerstyle.width = unit.pixel(60);                 templatecolumn.headerstyle.wrap = true;                  this.radgridparlistitems.mastertableview.columns.add(templatecolumn);               }         }         catch (exception ex)         {           }     } 

the above method called on click of button.

in each of columns added adding textbox follows :

#region namespaces used using system; using system.web; using system.collections.generic; using system.web.ui; using system.web.ui.webcontrols; using system.data; using telerik.web.ui; #endregion  /// <summary> /// summary description radgridtemplate /// </summary> public class radgridtemplate : itemplate {     protected literalcontrol lcontrol;     protected textbox textbox;     private string colname;     public radgridtemplate(string cname)     {         colname = cname;     }     public void instantiatein(system.web.ui.control container)     {          textbox = new textbox();         textbox.id = container.id + "txtparqty";         textbox.width = unit.pixel(50);         container.controls.add(textbox);          textbox.text = httpcontext.current.request.form[textbox.uniqueid];     }    } 

now there button,"save" when clicked upon have fetch data textboxes in dynamically added controls. trouble :

on post controls cleared , re-created values null.

how capture values of textboxes in row.

if instantiate template columns on init explained in telerik docs here, should able keep state steady on posbacks , fetch data textboxes looping through grid rows.