If you have only one admit
than use the employee id of the admin directly in the program.
like:
Let the employee id of the admin is 1.
if(emp_id == 1)
{
Response.Redirect("//Admin Page.");
}
else
{
Response.Redirect("//User Page.");
}
If you want to assign more than one admin than create a new column your login details table .(column name IS_ADMIN) and set as 1 for admin and 0 for general user.
and use that one:
if(IS_ADMIN == 1)
{
Responce.Redirect("//Admin Page");
}
else
{
Response.Redirect("//User Page");
}