Page_PreRender fires twice on first load in session

Question

When I run the web application, I notice that Page_PreRender is fired twice. This only happens the first time in a new session. It does not happen if I refresh the page, or on postbacks. I use .NET framework 3.5 and the built in ajax functionality.

• ^{The problem is not related to img tag with empty src attribute (which I have seen other posts with similar problem has mentioned). I know this because I see this in both FireFox and IE. The posts I saw about this stated that this was not a problem in IE. I have also searched and found no img tags with empty src in the generated page source, so it should not be this.}

• ^{I have also made a simple test page where I have included some of the functionality, and this does not happen.}

Have anyone any suggestions on what happens?

Note:
It is the entire page cycle that is firing twice, not just render.

Answer 1

Hey,

I've experienced it; it's probably not what you are experiencing, but I'll enter it here anyway; I've noticed it when the application does a Response.Redirect at the PreRender level, which a redirect does not stop current execution, but makes it appear the event happens twice...

Again, probably not related, but including it just in case.