I've a webpart with a single asp:button, I've noticed that the
Page.IsPostBack is not changing its state even though the user click on the button.
Also,I got an error when trying to using something like this
Message "Object reference not set to an instance of an object."
Have someone went through an issue like this?
The Client is a Sharepoint Online.
Local Environment: Sharepoint 2013 On Premise, Visual Web Part for Sandboxed solution