ASP.NET事件处理程序不更改UI

Question

I have an instance of a custom business class on a asp.net web forms page (.NET 4.0). This class has custom events that get thrown. My web forms page establishes the event handlers for the events before calling the business class. These event handlers do stuff to the page (set a label's text, change a mulitview, etc.). My problem is that sometimes, the event handler fires (verified by debugging the code and running through it), but the changes to the UI (setting a label's text) does not show on the page

Here is an simplified example -

private void MyMethod()
{
   var myClass = new MyClass();
   myClass.PromptForAdditionalData += OnPromptForMoreData;
   myClass.DoSomethingElse += OnDoSomethingElse;

   myClass.ExecuteMethod();
}

private void OnPromptForMoreData(object sender, EventArgs e)
{
   label3.Text = "Blah blah blah";
   multiView1.SetActiveView(view1);
}

Answer 1

Other options without AJAX, try to postback or redirect to current page.

This is the link to redirect : https://msdn.microsoft.com/en-us/library/a8wa7sdt(v=vs.110).aspx