ASP.NET Page.OnLoad executes twice

Question

Anyone have any idea when and why Page.OnLoad() executes twice in the ASP.NET lifecicle?

Answer 1

Another possibility is that Visual Studio browser link is enabled. To figure out what caused the issue you can inspect the Request object.

Answer 2

Make sure you don't have any tags like <img src="#"> or <img src="">, that makes IIS load the page twice. It's a classic.

Answer 3

Do you have AutoEventWireUp set to true and also attaching an event handler in code? This is a common reason.

Answer 4

Do you have any controls with AutoPostBack set to true ? That will cause the Page object to be recreated and therefore the PageLoad method will execute again.

Answer 5

Do you have a an IMAGE element with a blank string for the URL on that page?

This one has caught so many people before :)