if (Request.Cookies["UsersName"].Value==null)
===>
if (Request.Cookies["UsersName"]==null || Request.Cookies["UsersName"].Value == null || Request.Cookies["UsersName"].Value == String.Empty)
===>
if (Request.Cookies["UsersName"]==null || Request.Cookies["UsersName"].Value == null || Request.Cookies["UsersName"].Value == String.Empty)
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