How to gridview.rowcommand for the first row on page load

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C#

ASP.NET

Dear
My scenario is when i click on link button in a gridview under row command.First row selected and perform further work.I want to do the same at page load after grid is binded.How could i call row command for the first row at page load using asp.net.

My Code is here

try
       {
           if (e.CommandName == "do")
           {
               GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
               Session["reg_no"] = ((HiddenField)row.FindControl("hidRegNo")).Value;
               string CS_FLAG = ((HiddenField)row.FindControl("hid_Flag")).Value;
               Session["CS_IS_HANDLE"] = ((HiddenField)row.FindControl("hid_IsHandle")).Value;
               if (CS_FLAG == "Y")
               {
                   this.lnk_Enlarge.Visible = false;
                   Panel_Disable();
                   lblStatus.Text = "This Account is locked and has moved to supervisor";
                   ModalPopupExtender.Show();
               }
               else
               {
                   Session["Loan_acct"] = ((HiddenField)row.FindControl("hidLoanNo")).Value;
                   Session["Cycle_cut"] = ((HiddenField)row.FindControl("hidCycleCut")).Value;
                   Session["Bucket_Code"] = ((HiddenField)row.FindControl("hidBucketCode")).Value;
                   Session["Module"] = ((HiddenField)row.FindControl("hid_Mod")).Value;
                   Session["Product"] = ((HiddenField)row.FindControl("hid_Prod")).Value;
                   Session["City"] = ((HiddenField)row.FindControl("hid_City")).Value;
                   Session["Billing_Cycle"] = ((HiddenField)row.FindControl("hid_BillingCycle")).Value;
                   this.Tabs.Visible = true;
                   this.pnl_ActLog.Visible = true;
                   ShowFinancial();
                   ShowSituationSummary();
                   Show_PIL_Overdue();
                   ShowActivity();
                   ShowAppInfo();
                   ShowDelinquencyHistory();
                   ShowSchedule();
                   ShowContacts();
                   Show_Diary();
                   Load_All();
                   Show_Actions();
                   Show_DiaryNote();
                   Reset();
               }
           }
           lbl_Status.Text = "";
       }
       catch (Exception ex)
       {
           throw new Exception("Application Error: " + ex.Message);
       }