How to get "Guid" variable from http header in ASP.NET

Question

The following line gives an error (cannot convert type "string" to "System.Guid")

userId = Request.QueryString["id"];

is there any solution to pass Guid variable in http header Get?

Answer 1

try {
    userId = new Guid(Request.QueryString["id"]);
} catch (FormatException e) {
    /*
     * It's possible that the guid is not properly formatted and an
     * exception will be thrown, so handle that here.
     */
}