HttpResponse.Redirect Method
Definition
Important
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Redirects a client to a new URL.
Overloads
| Redirect(String) |
Redirects a request to a new URL and specifies the new URL. |
| Redirect(String, Boolean) |
Redirects a client to a new URL. Specifies the new URL and whether execution of the current page should terminate. |
Redirect(String)
Redirects a request to a new URL and specifies the new URL.
public:
void Redirect(System::String ^ url);public void Redirect (string url);member this.Redirect : string -> unitPublic Sub Redirect (url As String)Parameters
- url
- String
The target location. This may be an application-relative virtual path.
Exceptions
A redirection is attempted after the HTTP headers have been sent.
Examples
The following example forces an unconditional redirection to another Web site.
Response.Redirect("http://www.microsoft.com/gohere/look.htm");
Response.Redirect("http://www.microsoft.com/gohere/look.htm")
Remarks
Calling Redirect is equivalent to calling Redirect with the second parameter set to true.
Redirect calls End which throws a ThreadAbortException exception upon completion. This exception has a detrimental effect on Web application performance. Therefore, we recommend that instead of this overload you use the HttpResponse.Redirect(String, Boolean) overload and pass false for the endResponse parameter, and then call the CompleteRequest method. For more information, see the End method.
Note
For mobile pages only, if your application relies on cookieless sessions, or might receive requests from mobile devices that require cookieless sessions, using a tilde (~) in a path can result in creating a new session and potentially losing session data. To set a property on a mobile control with a path such as "~/path", resolve the path using ResolveUrl "~/path" before assigning it to the property.
ASP.NET performs the redirection by returning a 302 HTTP status code. An alternative way to transfer control to another page is the Transfer method. The Transfer method is typically more efficient because it does not cause a round trip to the client. For more information, see How to: Redirect Users to Another Page.
Applies to
Redirect(String, Boolean)
Redirects a client to a new URL. Specifies the new URL and whether execution of the current page should terminate.
public:
void Redirect(System::String ^ url, bool endResponse);public void Redirect (string url, bool endResponse);member this.Redirect : string * bool -> unitPublic Sub Redirect (url As String, endResponse As Boolean)Parameters
- url
- String
The location of the target.
- endResponse
- Boolean
Indicates whether execution of the current page should terminate.
Exceptions
url is null.
url contains a newline character.
A redirection is attempted after the HTTP headers have been sent.
The page request is the result of a callback.
Examples
The following example uses the IsClientConnected property to check whether the client that is requesting the page remains connected to the server. If IsClientConnected is true, the code calls the Redirect method, and the client will view another page. If IsClientConnected is false, then the code calls the End method and all page processing is terminated.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void Page_Load(object sender, EventArgs e)
{
// Check whether the browser remains
// connected to the server.
if (Response.IsClientConnected)
{
// If still connected, redirect
// to another page.
Response.Redirect("Page2CS.aspx", false);
}
else
{
// If the browser is not connected
// stop all response processing.
Response.End();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Private Sub Page_Load(sender As Object, e As EventArgs)
' Check whether the browser remains
' connected to the server.
If (Response.IsClientConnected) Then
' If still connected, redirect
' to another page.
Response.Redirect("Page2VB.aspx", false)
Else
' If the browser is not connected
' stop all response processing.
Response.End()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
</form>
</body>
</html>
Remarks
An absolute URL (for example, http://www.contoso.com/default.aspx) or a relative URL (for example, Default.aspx) can be specified for the target location but some browsers may reject a relative URL.
When you use this method in a page handler to terminate a request for one page and start a new request for another page, set endResponse to false and then call the CompleteRequest method. If you specify true for the endResponse parameter, this method calls the End method for the original request, which throws a ThreadAbortException exception when it completes. This exception has a detrimental effect on Web application performance, which is why passing false for the endResponse parameter is recommended. For more information, see the End method.
Note
For mobile pages, if your application relies on cookieless sessions, or might receive requests from mobile devices that require cookieless sessions, using a tilde (~) in a path can create a new session and potentially lose session data. To set a property on a mobile control with a path such as "~/path", resolve the path using ResolveUrl "~/path" before assigning it to the property.
ASP.NET performs the redirection by returning a 302 HTTP status code. An alternative way to transfer control to another page is the Transfer method. The Transfer method is typically more efficient because it does not cause a round trip to the client. For more information, see How to: Redirect Users to Another Page.
