I'm using ASP.Net to create a WebForm.

In my Page_Load(), I want to test for IsPostBack and capture parameters if any. Here's what I do.

///Page_Load()
string lcKey;
if (Page.IsPostBack)
{
  lcKey = Request.QueryString["myKey"];
}

However, if Page.IsPostBack = True and there were not any parameters passed, I get this error:

Object reference not set to an instance of an object.

If I have a Request.QueryString["myKey"];, do I have to pass parameters? Or, how can I test for parameters being passed?

Thanks,

Jerry