Logout works on two clicks

Question

Hi, I have created a button click event for logout on masterpage. 

I have to click twice the button get redirected to desired page.

 

protected void btnLogout_Click(object sender, EventArgs e)

{

Session.Abandon();

Session["StaffID"] = null;

Session["User"] = null;

Session.RemoveAll();

Response.Clear();

Response.Redirect("~/Logout");

}