Response.Redirect in c# class.

manish.sharma04 · May 10th, 2006, 10:55 AM

hi,
I have one class library project created, there is one class BaseUIController in that, I want to write Navigate() method in the class would work as good as Response.Redirect("URL")
Function declaration is:
public void NavigatePage(string URL)
{

}

Please tell me how can I implement it, because System.Web.UI is not avaliabe in class library type projects, so I can'nt use Response.Redirect(URL).
Please guide me.

Thanks is advance,
manish

Imar · May 10th, 2006, 12:28 PM

Hi manish,

From a good design perspective, you should let the class library simply return a value that you use to determine where to redirect to in the presentation layer (the .aspx pages). By letting the class library redirect users, you tie it to a web application, which limits its reuse possibilities.

That said, you can add a reference to System.Web in your class library. Then you access objects like Response and Session in the class library like this:

System.Web.HttpContext.Current.Response.Redirect(" SomePage.aspx");

Note that this method will fail when it's accessed from outside a Web app (e.g. a Console app, Windows Forms etc)

HtH,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004

manish.sharma04 · May 12th, 2006, 01:20 AM

Thanks Imar!
-Manish

Red_October7 · October 30th, 2007, 05:33 AM

Hi Imar,
I tried using the system.web.httpcontext.current.response.redirect(" mypage.aspx"); in the class library... but in runtime, its specifying that the object is null and not set to an instance. any ideas??? what do i need to do as alternative.

thanx in advance. please reply asap...
RO

Imar · October 30th, 2007, 03:53 PM

Hi there,

Can you show us your exact code and explain where it is being called?

Imar

---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004

testuser13 · February 11th, 2011, 04:29 PM

I have the same issue as Red_October. I have a button and the code behind for the button is
HttpContext.Current.Response.Redirect("URL", false);
when click on the button, system give this error "Object reference not set to an instance of an object"

can anyone help me with this issue?

Imar · February 12th, 2011, 05:41 AM

If you have the same issue as Red_October, the same response to the question applies ;-)

Quote:

Can you show us your exact code and explain where it is being called?

That is, explain the setup of your site / application, and show us the code for the page.

Cheers,

Imar

testuser13 · February 12th, 2011, 09:20 AM

I have a SharePoint site http://moss2007
I have a page on this site call ViewMyStaff.aspx (this is just a blank webpart page). when the user clicks on the button, system should take me to http://moss2007/Pages/ViewMyStaff.aspx page. The form library is in the same site collection as this page

httpcontext.current.response.redirect("http://moss2007/pages/ViewMyStaff.aspx", false)

Thanks in advance,

Imar · February 13th, 2011, 10:26 AM

You may be better off posting this in a SharePoint category, and provide more code that demonstrates the problem.

Cheers,

Imar

JafarKofahi · February 16th, 2012, 01:13 PM

Hi Imar,

I have the same problem, in my case I am trying to do the redirect from a VB.Net module, here is the code:

Code:

 Public Sub ShowEPSErrorPage(Optional ByVal strErrorMessage As String = gGenericErrorMessage,Optional ByVal strDetailedMessage As String = "")

            HttpContext.Current.Session.Add(ErrorPage.SA_ERR_MESSAGE, strErrorMessage)
            HttpContext.Current.Session.Add(ErrorPage.SA_DETAILS_MESSAGE, strDetailedMessage)
            HttpContext.Current.Response.Redirect("/ErrorPage.aspx")
End Sub

I have System.Web imported and as I said this is in a module which is part of my web application.

When I debug this, sometimes the debugger will be able to evaluate HttpContext.Current and sometimes it would tell me "Unable to evaluate expression", but either way this throws an exception with a message "Unable to evaluate expression"!! the path is proper so I am not sure what am I missing or doing wrong?

Thanks
Jafar