Creating Cookie in the Master Page of C# Application

Hey Guys,

I am calling a funtions in master page to create cookie
the function looks like this
    public void savecookie(string cookiename, string cookievalue, string cookieexp)
    {
        HttpCookie cookie = new HttpCookie(cookiename);
        cookie.Value = cookievalue;
        cookie.Expires.AddDays(Convert.ToDouble(cookieexp));
        Response.Cookies.Add(cookie);
    }

The call looks like this
mast.savecookie("zipcodecook", zipcode.Text.ToString(), "10");

I continue to get this error
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 74:         cookie.Value = cookievalue;
Line 75:         cookie.Expires.AddDays(Convert.ToDouble(cookieexp));
Line 76:         Response.Cookies.Add(cookie);
Line 77:     }
Line 78:     #endregion
 

If I create a cookie on the page it works finr just not in the master page code file it doesn't

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