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I am trying to like below but throwing an error "
Object reference not set to an instance of an object.

string roll = Request.Cookies["StudentCookies"].Value;
            if (roll == null || roll == String.Empty)

string roll = Request.Cookies["StudentCookies"] == null ? "" : Request.Cookies["StudentCookies"].Value;
dawood abbas 19-Jun-15 5:26am
thanq but how to set null value to this coockie?
dawood abbas 19-Jun-15 5:26am
in logout page i want to null it..
OriginalGriff 19-Jun-15 5:49am
Response.Cookies["StudentCookies"].Value = null;
Response.Cookies["StudentCookies"].Expires = DateTime.Now.AddDays(-1);

To be sure, to be sure, to be sure... :laugh:
You are trying to use Request.Cookies.Value without checking it the cookie exists.

This is the correct check:
string roll = string.Empty;
// first check that cookie exists, if it does, use the value
if (Request.Cookies["StudentCookies"] != null) {
    roll = Request.Cookies["StudentCookies"].Value;

' if cookie wasn't present or the value is empty, redirect
if ( roll == string.empty)

Good luck.

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