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if(!string.IsNullOrEmpty(Session["emp_num"] as string))
{
//The code
}
http://stackoverflow.com/questions/7172910/checking-session-if-empty-or-not
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if(!string.IsNullOrEmpty(Session["emp_num"] as string))
{
//The code
}
http://stackoverflow.com/questions/7172910/checking-session-if-empty-or-not