code for seesion handling for login page in Asp.net c#

hello all
I have a login page for admin when I login it is redirecting admin.apsx after logout it is also redirectiing login page but when I type admin.aspx it is displaying admin.aspx.

In the below code I am just checking login id

I have code for session somthing on Login Page like this

cmd = new SqlCommand("select * from Login where loginid='" + txtlogid.Text + "'and password='" + txtpassword.Text + "'", conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
Session["logid"] = txtlogid.Text;
// Session("name") = txtlogid.Text; ;
//Session["password"] = txtpassword.Text;

Response.Redirect("Admin.aspx");


}
else
{
}

and in Admin.aspx page my code is


protected void Page_Load(object sender, EventArgs e)
{

try
{
if (Session["logid"] == null )
{
Response.Redirect("login.aspx");
}
else
{
do somthing
}
}
catch (Exception ex)
{


}
}

and on click logout button==============


Session.Remove("logid");

Response.Redirect("index.aspx");


please help me noe what I have to do I have no idea about session handling

thanxs
mpatel

 

Everything looks correct. I'm running out the door to work so real quick off the top my head:
In the logout button click event try changing Session.Remove("logid") to Session.Abandon().

I program in VB.Net not C# but shouldn't it be Session.Remove["logid"]; instead of the ()s.