In Findcontrol Line I Got Error Like Index Was Out Of Range. Must Be Non-Negative And Less Than The Size Of The Collection. Parameter Name: Index So,Plz, Give Solution.

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
  {
      if (!e.CommandName.Equals("Page"))
      {

          if (e.CommandName.Equals("cmdViewDetails"))
          {
              Int32 index = Convert.ToInt32(e.CommandArgument);

              HiddenField hd =(HiddenField)GridView1.Rows[index].FindControl("HiddenField1");
              Int64 cid = Convert.ToInt64(hd.Value);
              Response.Redirect("ViewCProfile.aspx?cid=" + cid);
          }
      }
  }