every time Page_Load event called?

Thanks for writing article.

another way:
http://www.c-sharpcorner.com/UploadFile/suthish_nair/3781/Default.aspx?ArticleID=8d6a6498-9ead-481b-997f-3d264369d509
but theres some security issues.

Hi Suthish
My problem is solved by this
http://dotnetslackers.com/Events/re-23154_Capture_Master_Page_Events_in_Content_Pages_ASP_NET_2_0.aspx
article
but it is very difficult
Which solution you give me it never
if (Request.QueryString["formname"] != null)
{
} never true
you can also read this article.
if any other easy solution then please explain.
Thanks any way
 i m marking it answer.

Yes. You need to check if QueryString value is not null.
if (Request.QueryString["formname"] != null)
{
}

hi,
   You can check some conditions like
   if( Request.QueryString["formname"].ToString()!=dbNull.ToString())
   {
       string formvalue = Request.QueryString["formname"].ToString();
    }

Hi
In this query sting always null because  contant form load event called before master page button click event.
i want to display query sting value when content form load event call

same project uploaded...
 

Hi sunthsh
Can you give example
of passing query string from master page(button click event) to content page

it seems working for me.. as suggested on earlier forum, put breakpoints on every page and check the error. I think something else causing the problem.

error in this: string formvalue = Request.QueryString["formname"].ToString();  ///Object reference not set to an instance of an object.
//when i click on the button then error occur here because button click event
protected void btnCategory_Click(object sender, EventArgs e)
    {
       
        Response.Redirect("~/Forms/frmView.aspx?formname=Category"); 
    }

 not called and when i make comment to these three lines then button click event ( btnCategory_Click) execute successfully.

you can help me by check it http://www.c-sharpcorner.com/Forums/UploadFile/96725

I have already try  if (!IsPostBack) {}

you need : if (!IsPostBack) {}

Master page button click event code
protected void btnCategory_Click(object sender, EventArgs e)
    {
       
        Response.Redirect("~/Forms/frmView.aspx?formname=Category"); 
    }

content page onload even code
    protected void Page_Load(object sender, EventArgs e)
    {
        txtFromDate.Text = DateTime.Now.AddMonths(-1).ToString("MM/dd/yyyy");
        txtToDate.Text = DateTime.Now.ToString("MM/dd/yyyy");
       
        //Session["is_starting"]=
        if (Session["is_starting"] == "yes")
        {
            RefreshData("Category");
           
            Session["is_starting"] = null;
        }
        else
        {
            string formvalue = Request.QueryString["formname"].ToString();  //when i click on the button then error occur here because button click event not called and when i make comment to these three lines then button click event ( btnCategory_Click) execute successfully.
            Response.Write("");
            RefreshData(formvalue);
           // RefreshData("StudentProspects");
        }
        //Response.Write("");

    }

You must know about Master Page and Content Form hierarchy.
readon: http://odetocode.com/Articles/450.aspx