How to destroy query string after redirecting from one page to another page on page load event?

Question

I am having 2 pages name as :

• Abc.aspx
• pqr.aspx

Now on page load of Abc.aspx i am doing this:

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (!string.IsNullOrEmpty(Request.QueryString["Alert"]))
                {
                    if (Request.QueryString["Alert"] == "y")
                    {
                      //Here on redirection from Pqr.aspx i will display Javascript alert that your "Your data save"
                    }
                }
                else
                {
                        //Dont do anything
                 }
            }

        }

Now from pqr.aspx page i am redirecting to Abc.aspx and passing query string on button click:

     protected void Save_Click(object sender, EventArgs e)
     {
        //saving my data to database.
        Response.Redirect("~/Abc.aspx?Alert=yes");
     }

But what is happening is if anybody enters url like this in browser then still this alert is coming:

http://localhost:19078/Abc.aspx?Alert=yes

Then still this javascript alert box comes.

What i want is after redirecting from my Pqr.aspx page only this alert should come.

How to do this??

Answer 1

In Asp.net there is an object named Request.UrlReferrer.With this property you can get the previous page from which you come to the current page

protected void Page_Load(object sender, EventArgs e)
{
      if (!IsPostBack)
      {
           if (!string.IsNullOrEmpty(Request.QueryString["Alert"]))
           {
               if (Request.QueryString["Alert"] == "y" && Request.UrlReferrer != null && Request.UrlReferrer.LocalPath == "/pqr.aspx") // if the root is same
               {
                   //Here on redirection from Pqr.aspx i will display Javascript alert that your "Your data save"
               }
               else
               {
                        //Dont do anything
               }
           }
       }
}