Asp.net clicking the server button does not trigger background events Solution

Other operations were performed before the upload button during project creation two days ago. It was found that clicking the upload button did not trigger the background submission event. The click does not respond.

It's strange.

ViewCodeThere is no exception.

 

Later, I checked that the code-behind submission was invalid! I have not figured out the cause of the failure. I hope you can talk more about it.

 

So I have to solve this problem. It will be found in the button attribute later.UsesubmitbehaviorSet it to false.

Usesubmitbehavior = "false"

Code:

Upload attachment: <asp: fileupload id = "fileupload1" runat = "server"/> <br/> <asp: button id = "button_up" runat = "server" text = "Upload" onclick = "button_up_click" usesubmitbehavior = "false"/>