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POIn C# asp.net is it possible to send back a valid web page half way through a method?
 

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  1. POIn C# asp.net is it possible to send back a valid web page half way through a method?
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    <p>When I want to redirect a user who has lost session state back to the StartPage I find Response.Redirect("~/StartPage.aspx") causes the error "Response Redirect Cannot Be Called In A Page Callback". Therefore in a Page.IsCallback situation I want to add javascript to do the redirect - this works - see code below.</p> <pre><code>protected void ForceBackToStartPage() { if (Page.IsCallback) { string fullLoginUrl = ConvertRelativeUrlToAbsoluteUrl( "~/StartPage.aspx" ); string script = string.Format("window.location.href = '{0}';", fullLoginUrl); ClientScriptManager cm = Page.ClientScript; cm.RegisterClientScriptBlock(GetType(), "redirect", script, true); //Response.Flush(); //Response.End(); } else { Response.Redirect("~/StartPage.aspx"); } } </code></pre> <p>After I have added the javascript in this section the code continues to process normally leaving this function and going off to other processing sections of the webpage - probematic as the user has no session data. Ideally I'd want processing of this web page to finish - and for the page to return in a valid state so that the user gets redirected.</p> <p>Is this possible?</p> <p>I thought Response.Flush(); Response.End(); might do the trick - but the webpage sent back to the browser causes XML Parse errors.</p> <p>Further info: I check for missing session data in a few places (depending on the webpage - this code is in lots of web pages) - for instance - PageLoad and from some submit button methods.</p> <p>Before the new method I used this code e.g.:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if ((string)Session["OK"] != "OK") { // the session has timed out - take them back to the start page Response.Redirect("~/StartPage.aspx"); } ...rest of processing </code></pre> <p>Now it's invoked like this:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if ((string)Session["OK"] != "OK") { // the session has timed out - take them back to the start page ForceBackToStartPage(); } ...rest of processing </code></pre> <p>so I could obviously use</p> <p>else { ...rest of processing }</p> <p>but I was hoping not to have to do that as SVN Source Control takes that to mean I've re-written the whole 'rest of processing' section. This is problematic as when I merge from a branch into the trunk it does not check I am not overwriting mods because it assumes it's all new code coming in. </p>
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