Session loosing after Response Redirect in Asp.Net
Default.aspx Code Behind
protected void btnsubmit_Click(object sender, EventArgs e)
{
    HttpContext.Current.Session["username"] = txtusername.Text;
    Response.Redirect("~/Dashboard.aspx", false);
}
  Dashboard.aspx Code Behind 
protected void Page_Load(object sender, EventArgs e)
{
    lblusername.Text = Session["username"].ToString();
}
 IIS 8.0 Setting Session State -> In process -> Cookies Mode -> Use Cookies -> Time-out = 60 .NET Framework 4.0