How to check that Request.QueryString has a specific value or not in ASP.NET?

Question

I have an error.aspx page. If a user comes to that page then it will fetch the error path in page_load() method URL using Request.QueryStrin

Answer 1

You can also try:

if (!Request.QueryString.AllKeys.Contains("aspxerrorpath"))
   return;

Answer 2

What about a more direct approach?

if (Request.QueryString.AllKeys.Contains("mykey")