Search grid view created dynamically inside a asp panel using id

See more:

C#

Gridview

controls

ASP.NET4

Hi
i have created few dynamic grid view inside a panel

Method where i added control

pRelaese.Controls.Add(DynamicGrid(dt));

i'm saving the grid view id in a hidden variable

i added a button inside a update panel

string[] GridName = hdnGridName.Value.Split(',');
      foreach (string GN in GridName)
      {
          GV = this.FindControl("pRelaese").FindControl(GN) as GridView;//tried this
          pnl = (Panel)Page.FindControl("pRelaese");//tried this
          GV = (GridView)pnl.FindControl(GN);//tried this
          if (GV != null)
          {
              foreach (GridViewRow GVR in GV.Rows)
              {
                  //codes
              }
          }
      }

But every time the

null 

is returned to GV

i need to find control and insert it into GV to perform of the task