need code for login and logout with session time out

login.aspx.cs code

public string GetConnectionString()
    {
        return System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString1"].ConnectionString;
    }


    protected void Login_Click(object sender, EventArgs e)
    {
        SqlDataSource sds = new SqlDataSource();
        sds.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString1"].ToString();


        sds.SelectParameters.Add("Username", TypeCode.String, this.Username.Text);
        sds.SelectParameters.Add("Password", TypeCode.String, this.Password.Text);


        sds.SelectCommand = "SELECT * FROM [LogIn] WHERE [Username] = @Username AND [Password] = @Password";


        DataView dv = (DataView)sds.Select(DataSourceSelectArguments.Empty);


        if (dv.Count == 0)
        {
            this.Labelinfo.ForeColor = System.Drawing.Color.Red;
            this.Labelinfo.Text = "Invalid username and password!";
            return;
        }
        else
        {
            this.Session["Username"] = dv[0].Row["Username"].ToString();
            Response.Redirect("admin/Default.aspx");
            Username.Text = "";
            Password.Text = "";
            Labelinfo.Text = ""; 
        }
    }




logout.aspx.cs code


using above code its redirecting to back page without authentication...

so Please Help ...

Thanks for valuable reply

if u using the session then on logout clear all the session. and on each and every page just check that session contain any value in it. if it does not contain any value then it must redirect it to login or home page.

i have code of login and logout its working. after logout(login.aspx -> home.aspx -> logout.aspx ) and . if i copy home page url and directly paste in.. then it redirect to that page

Hi Sagar Patil,
i can help u with this but i want to know how far have u tried it by urself regarding login or logout.