Forcing a postback

Question

Is there a way to force a postback in code?

I'm looking to force the raising of a postback from a method in the c# code behind my asp.net web application.

Can you be more specific - and tell us what approaches you have tried so far? — Richard Ev, Nov 21 '11 at 09:56
eh, a postback is from client (browser) to server. So C# code (that runs on the server) can't do that. — Hans Keﬆing, Nov 21 '11 at 09:57
I think your question is similar to the one raised [here](http://stackoverflow.com/questions/1418532/how-to-force-a-postback-with-asp-net-and-c-sharp) — seanzi, Nov 21 '11 at 09:59
@Richard Ev I'm looking to dynamically add UserControls to the web app. Clicking a button will increment the number of controls, but the new control will not be displayed until the `Page_Load` method fires on postback (after the next button click). So I need to force a postback at the end of the method that increments the number of controls. — shaun.breach, Nov 21 '11 at 10:09
possible duplicate of [How do I force full post-back from a button within an UpdatePanel?](http://stackoverflow.com/questions/2545508/how-do-i-force-full-post-back-from-a-button-within-an-updatepanel) — TylerH, Apr 22 '15 at 14:44

score 10 · Answer 1 · edited Feb 27 '12 at 16:41

10

You can try redirecting to same page.

Response.Redirect(Request.RawUrl);

edited Feb 27 '12 at 16:41

sth

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answered Feb 27 '12 at 16:30

live-love

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But then the form values are lost… – Protector one May 02 '16 at 10:24
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@Protectorone not unless you ViewState[] them first and reload on the subsequent postback in Page_Load() – Fandango68 May 05 '17 at 07:09

score 9 · Accepted Answer · edited May 23 '17 at 11:46

9

A postback is triggered after a form submission, so it's related to a client action... take a look here for an explanation: ASP.NET - Is it possible to trigger a postback from server code?

and here for a solution: http://forums.asp.net/t/928411.aspx/1

edited May 23 '17 at 11:46

Community

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answered Nov 21 '11 at 10:00

mamoo

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For those using newer versions of .NET, you have to use `Page.ClientScript.GetPostBackEventReference` since 'this.GetPostBackEventReference(...)' is obsolete. Also probably `Page.ClientScript.RegisterStartupScript(...)`. – AzNjoE Feb 29 '16 at 21:33

score 6 · Answer 3 · answered Oct 10 '13 at 10:45

6

Simpler:

ScriptManager.RegisterStartupScript(this.Page, this.Page.GetType(), "DoPostBack", "__doPostBack(sender, e)", true);

answered Oct 10 '13 at 10:45

devilcius

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score 3 · Answer 4 · answered Oct 14 '15 at 10:14

Here the solution from http://forums.asp.net/t/928411.aspx/1 as mentioned by mamoo - just in case the website goes offline. Worked well for me.

StringBuilder sbScript = new StringBuilder();

sbScript.Append("<script language='JavaScript' type='text/javascript'>\n");
sbScript.Append("<!--\n");
sbScript.Append(this.GetPostBackEventReference(this, "PBArg") + ";\n");
sbScript.Append("// -->\n");
sbScript.Append("</script>\n");

this.RegisterStartupScript("AutoPostBackScript", sbScript.ToString());

score 1 · Answer 5 · answered May 13 '14 at 09:52

1

By using Server.Transfer("YourCurrentPage.aspx"); we can easily acheive this and it is better than Response.Redirect(); coz Server.Transfer() will save you the round trip.

answered May 13 '14 at 09:52

Ensari

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Doesn't this reset the form fields? I guess it's like a fresh page call which means user-inputs like filters would be undone (if they aren't stored in session). – Vortex852456 Oct 14 '15 at 10:16

score 1 · Answer 6 · answered Nov 21 '11 at 10:01

1

No, not from code behind. A postback is a request initiated from a page on the client back to itself on the server using the Http POST method. On the server side you can request a redirect but the will be Http GET request.

answered Nov 21 '11 at 10:01

Andy Rose

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score 1 · Answer 7 · answered Nov 21 '11 at 10:19

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You can use a data-bound control like the Repeater or ListView, re-bind it to a list of control properties as needed, and let it generate the controls dynamically.

As an alternative, you can use Response.Redirect(".") to re-load the same page.

answered Nov 21 '11 at 10:19

Mihai

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score 0 · Answer 8 · answered Nov 21 '11 at 10:04

You can manually call the method invoked by PostBack from the Page_Load event:

public void Page_Load(object sender, EventArgs e)
{
    MyPostBackMethod(sender, e);
}

But if you mean if you can have the Page.IsPostBack property set to true without real post back, then the answer is no.

Forcing a postback

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