c# - error using FindControl on div id

Question

I have an ASP.NET site that I am trying to access div elements by their ID from the C# code behind file. Essentially I want to see if a div element exists, and if so, alter its

Answer 1

If you add runat=server please add it at last of the div:

This will work

However, this will not

By doing that, you can modify any property from codebehind as:

divBtn.Style["display"] = "none";

This works even with masterpages. The div is not included in a masterpage.