Page.DeterminePostBackMode Method ()
Returns a NameValueCollection of data posted back to the page using either a POST or a GET command.
Assembly: System.Web (in System.Web.dll)
Return ValueType: System.Collections.Specialized.NameValueCollection
A NameValueCollection object that contains the form data. If the postback used the POST command, the form information is returned from the Context object. If the postback used the GET command, the query string information is returned. If the page is being requested for the first time, null is returned.
Available since 1.1