Adds ability to pass default parameter for query string values in C# web projects.

gistfile1.cs

/* 
  Adds ability to pass default parameter for query string values in C# web projects.

  http://example.com/?key=1
  GET("key", "default") returns "1"

  http://example.com/
  GET("key", "default") returns "default"
*/

public string GET(string name, string def = null)
{
    var req = Request.QueryString[name];

    if (!String.IsNullOrWhiteSpace(req))
    {
        return req;
    }

    return def;
}