Need help regarding query string in asp.net

I have a page create-quote.aspx. I want to open this page in 开发者_开发知识库different modes, depending on whether a querystring parameter is present or not.

My question is at which event should I check, If I have a querystring parameter or not. I think, it should be preinit, what do you say.

Probably the best choice is to handle them on Page_Load event:

http://msdn.microsoft.com/en-us/library/ms178472.aspx#lifecycle_events

You're correct. You should check the querystring in the preinit event. Before the Initialzation there is a start fase where the request en response objects are created.

Reference: http://msdn.microsoft.com/en-us/library/ms178472.aspx

I would check that in the Page_Load event something like this:

Page_Load  {

if(!Page.IsPostback) 
{


    if(Request.QueryString["id"] != null) 
     {
        // do whatever with the id value 
     }

}


}