My Session is Expiring when User is Active

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session

Hello Geeks !!

I am having problem with session
that is expiring whenever user is active and working something on page i have made this code on master page

protected void Page_Load(object sender, EventArgs e)
       {
           try
           {
               if (Session[EmPId] == null)
               {
                   Response.Redirect(~/Default.aspx, false);
               }
               else
               {
                   Emptr = Convert.ToInt32(Session[EmPId]);
               }



           }
           catch (Exception ex)
           {

           }
       }

on a page i have made this code

protected void Page_Load(object sender, EventArgs e)
       {
           try
           {
               if (Session[EmPId] == null)
               {
                   Response.Redirect(~/Default.aspx, false);
               }
               else
               {
                   Emptr = Convert.ToInt32(Session[EmPId]);
               }



           }
           catch (Exception ex)
           {

           }
       }

and my web.config file is like this

<sessionState timeout="50000"></sessionState>

my this page 's master page is set above master page

i am in a big trouble due to this problem as its too irritating for a user.

thanks in advance...