c# - ASP.NET Set cookie ONLY if empty Value -


i trying set cookie when user access webpage. value of cookie unique number store on database keep track of when user comes website. set cookie in global.asax follow:

void application_beginrequest() {     string cookievalue = "";     string = "";     try     {         = getcookie();         if (!string.isnullorempty(a))         {             cookievalue = a;         }         else         {             cookievalue = setcookie();         }     }     catch (exception ex)     {      } }

in beginrequest() want check if cookie exist. if exist, nothing , keep value inside cookie. if doesn't exist, set cookie , add value.

public static string getcookie() {     string cookievalue = "";     try     {         if (httpcontext.current.request.cookies["testcookie"] != null)             cookievalue = httpcontext.current.response.cookies["testcookie"].value;     }     catch (exception ex)     {         //     }      return cookievalue; } public static string setcookie() {     string cookievalue = "";     try     {         httpcookie mycookie = new httpcookie("testcookie");         // set cookie value.         mycookie.value = "1234"; //1234 unique number         mycookie.expires = datetime.now.addyears(50);         httpcontext.current.response.cookies.add(mycookie);         cookievalue = id;     }     catch (exception ex)     {         //     }      return cookievalue; }

the problem everytime reload page, "testcookie" gets rewritten new value. have been reading msdn how cookies stored in asp.net , according instructions, way supposed work fine. must doing wrong cannot see it. had code inside normal page e.g. test.aspx.cs test had same result , decided move application level , see if make difference did not :(.


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