Coding of LogOut Button in asp.net C#.

you can use logout button in your master page.
Step1-: First be remove the cache in load event of master page. like describe below.

 protected void Page_Load(object sender, EventArgs e)

    {     

        Response.Cache.SetCacheability(HttpCacheability.NoCache);

    }

Step2:- Now write the below code in click event of link button.


       protected void lnk_Click(object sender, EventArgs e)

    {

        Session.Abandon();

        

        Response.Redirect("~/Home.aspx");

    }

Coding of master page. 

public partial class InMaster : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {     
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
    }
    protected void lnk_Click(object sender, EventArgs e)
    {
        Session.Abandon();
        
        Response.Redirect("~/Home.aspx");
    }
}