how to get confirm box in codebehind in rowcommand gridview in asp.net C#

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ASP.NET

Please help me how to perform action on confirm box in row command event of gridview

My Code is as below:

protected void grdvwRecomm_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        string filename = "";
        string meetingfile = grdvwRecomm.DataKeys[Convert.ToInt32(e.CommandArgument.ToString())].Values[1].ToString();
        string newid = grdvwRecomm.DataKeys[Convert.ToInt32(e.CommandArgument.ToString())].Values[0].ToString();
        string scrpcd = grdvwRecomm.DataKeys[Convert.ToInt32(e.CommandArgument.ToString())].Values[4].ToString();
        string subtype = grdvwRecomm.DataKeys[Convert.ToInt32(e.CommandArgument.ToString())].Values[5].ToString();
        string strUrl = ConfigurationManager.AppSettings["downloadPath"].ToString();


               if (e.CommandName == "cmdLock")
        {
            if (subtype == "CCM")
            {
                ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), "script", "ChkCCM();", true);
                UpdateCounter(strNewId, scrpcd, newid);
            }
            else
            {
                UpdateCounter(strNewId, scrpcd, newid);
                BindData(strNewId);
            }
        }
    }

protected void UpdateCounter(string regid,string scripcd,string newid)
   {
       SqlParameter[] objprm = new SqlParameter[3];
       objprm[0] = new SqlParameter("@REG_NEW_ID", SqlDbType.VarChar);
       objprm[0].Value = regid;
       objprm[1] = new SqlParameter("@SCRIP_CODE", SqlDbType.VarChar);
       objprm[1].Value = scripcd;
       objprm[2] = new SqlParameter("@NEW_ID", SqlDbType.VarChar);
       objprm[2].Value = newid;
       DataSet ds = SqlHelper.ExecuteDataset(strCon, CommandType.StoredProcedure, "USP_UPDATE_REPORT_CNT", objprm);
       if (ds.Tables.Count > 0)
       {
           if (ds.Tables[0].Rows[0]["Msg"].ToString() == "NOT SUBSCRIB")
           {

               Page.RegisterStartupScript("", "<script>alert('Please Enter the Scrip into your Portfolio Account.');</script>");
           }
           else if (ds.Tables[0].Rows[0]["Msg"].ToString() == "PLEASE PROCEED")
           {

               Page.RegisterStartupScript("", "<script>alert('File is Available for Download.');</script>");
           }
           else if (ds.Tables[0].Rows[0]["Msg"].ToString() == "YOU HAVE NOT APPROVE BY IIAS TEAM")
           {
               Page.RegisterStartupScript("", "<script>alert('File is Not Free.');</script>");
           }

           else
           {
               Page.RegisterStartupScript("", "<script>alert('You have exceeded your limits.');</script>");

           }
       }
   }

Please let me know how can i check the value of confirm box "yes or no" on base of that my function should get called and update in dataset