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How do I refresh a page in ASP.NET? (Let it reload itself by code)

I'd rather not use Response.Redirect() because I don't know the page I will be on, as it's inside a user control inside a webpart inside SharePoint.

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  • 3
    I'm not OP, but one reason may be because javascript can be disabled Commented Jul 30, 2009 at 13:21
  • 12
    ASP.NET relies on javascript, so if a user has javascript disabled there's a bigger problem ... Commented Jul 30, 2009 at 13:25
  • @jrummell All native ASP.NET functionality should happen via HTTP calls and server-side code, so should work just fine with JavaScript disabled. If the user has written an ASP.NET web application that uses custom JavaScript, then yes that functionality would break, but ASP.NET will not break. Commented Mar 27 at 21:21
  • @TylerH that may be true now, but not in the old days of web forms. Commented Jun 14 at 17:33

14 Answers 14

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422

In my user controls, after updating data I do:

  Response.Redirect(Request.RawUrl);

That ensures that the page is reloaded, and it works fine from a user control. You use RawURL and not Request.Url.AbsoluteUri to preserve any GET parameters that may be included in the request.

You probably don't want to use: __doPostBack, since many aspx pages behave differently when doing a postback.

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4 Comments

@chris would you use a second parameter as Response.Redirect(Request.RawUrl, false)? Apparently, it is the best practice when using reponse.redirect. What do you think?
@aleafonso: I have never personally used the 2nd parameter, and never had any issues as a consequence, so I'm not sure what it buys you. But yes, according to the documentation, you should be using a 2nd parameter, but only if you're going to call CompleteRequest - which I have never bothered with.
Sometimes you might need AbsoluteUri, when the current page has an Id parameter (like a questionId here on stackoverflow). Or am I wrong?
@aleafonso is right - unless you need to halt all processing on the page, which is sometimes indicative of poor design plannning, you should pass a false as the second param. Not passing the 2nd param, or passing true, throws an HttpException and can impact performance and fill up event logs.
55

You can use the following line to do that:

Server.TransferRequest(Request.Url.AbsolutePath, false);

Try to avoid using Response.Redirect as it increases the steps in the process. What it actually does is:

  1. Sends back the page with redirection header
  2. The Browser redirects to the destination URL.

As you can see, the same outcome takes 2 trips rather than 1 trip.

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5 Comments

This worked in cases where Response.Redirect did not work correctly.
I've found that this does not clear the state of pages, eg the set .Text in a TextBox or the .Visible status of a Button.
Dumb question: where in the source of my ASPX page do I put that line?
@David.P You put it in the code behind page (the .aspx.cs file) within the function (like protected void DoSomething() { } for example) that fires whenever you expect the event to occur that you want to reload the page after.
This unfortunately appears to retain session information; if you call this as part of a button onclick method for example, then after it reloads the page, if you click refresh in the browser it will reattempt some onclick logic, even if necessary parameters are not met after the refresh. In my case, I click a button to add an input field's value to a database. The same value was added a second time when I manually refreshed the page, after Server.TransferRequest() was called to reload the page via the initial button click.
47

Once the page is rendered to the client you have only two ways of forcing a refresh. One is Javascript

setTimeout("location.reload(true);", timeout);

The second is a Meta tag:

<meta http-equiv="refresh" content="600">

You can set the refresh intervals on the server side.

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3 Comments

where should i put the setTimeout?
Please see the answer from @gaurav below for a good way to do this in .NET using Server.TransferRequest.
This may be correct for a page not using Server Side support, however it is wrong in relation to the specified .Net The correct way is to use Response.Redirect.
43

Try this:

Response.Redirect(Request.Url.AbsoluteUri);
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3 Comments

It will just send a redirection page instead of the page, causing a loop that the browser will stop when it sees that it won't ever get a real page...
@Guffa that depends entirly on the context in which the redirect is used. If it's used in an action / code block that is specifically called based on an action or condition then it will only fire once every iteration and if coded correctly in isolation.
This can result in loss of session data after the redirect. There's something about fully qualified urls that messes up sessions.
14

Use javascript's location.reload() method.

<script type="text/javascript">
  function reloadPage()
  {
    window.location.reload()
  }
</script>
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9

There are various method to refresh the page in asp.net like...

Java Script

 function reloadPage()
 {
     window.location.reload()
 }

Code Behind

Response.Redirect(Request.RawUrl)

Meta Tag

<meta http-equiv="refresh" content="600"></meta>

Page Redirection 

Response.Redirect("~/default.aspx"); // Or whatever your page url
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2 Comments

None of these methods reloaded my HTML images from the server. Are these methods all deprecated, or are they not intended to hard reload images?
@David.P In that case, you need to check your application/website. If Meta Tag and java script is not working then its issue... check it once.
7

If you don't want to do a full page refresh, then how about wrapping what you want to refresh inside of a UpdatePanel and then do an asynchronous postback?

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4

I personally need to ensure the page keeps state, so all the text boxes and other input fields retain their values. by doing meta refresh it's like a new post, IsPostBack is always false so all your controls are in the initialized state again. To retain state put this at the end of your Page_Load(). create a hidden button on the page with an event hooked up, something like butRefresh with event butRefresh_Click(...). This code sets a timer on the page to fire a postback just like a user clicked the refresh button themselves. all state and session is retained. Enjoy! (P.S. you may need to put the directive in the @Page header EnableEventValidation="false" if you receive an error on postback.

//tell the browser to post back again in 5 seconds while keeping state of all controls
ClientScript.RegisterClientScriptBlock(this.GetType(), "refresh", "<script>setTimeout(function(){ " + ClientScript.GetPostBackClientHyperlink(butRefresh, "refresh") + " },5000);</script>");
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3

You can't do that. If you use a redirect (or any other server technique) you will never send the actual page to the browser, only redirection pages.

You have to either use a meta tag or JavaScript to do this, so that you can reload the page after it has been displayed for a while:

ScriptManager.RegisterStartupScript(this, GetType(), "refresh", "window.setTimeout('window.location.reload(true);',5000);", true);
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3

In your page_load, add this:

Response.CacheControl = "no-cache";
Response.AddHeader("Pragma", "no-cache");
Response.Expires = -1;
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2 
Response.Write("<script>window.opener.location.href = window.opener.location.href </script>");
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2

The only correct way that I could do page refresh was through JavaScript, many of top .NET answers failed for me.

Response.Write("<script type='text/javascript'> setTimeout('location.reload(true); ', timeout);</script>");

Put the above code in button click event or anywhere you want to force page refresh.

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1 Comment

Will this hard reload also HTTP images from the server?
2

for asp.net core 3.1

Response.Headers.Add("Refresh", "2");// in secound

and

Response.Headers.Remove("Refresh");
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1 Comment

This didn't work for me but there is not much explanation, so perhaps I misunderstood? I just added the first line to my existing code, between these 2 lines: Response.AddHeader("content-disposition", "attachment; filename=" + ZipFileName) 'Response.Headers.Add("Refresh", "2") Response.TransmitFile(ZipFilePath) 'File.FullName);
2

You can use 2 ways for solve this problem:

  1. After the head tag

  2. If your page hasn't head tag you must use Javascript to implement

    function RefreshPage() { window.location.reload() }
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