From what I see in the source. The IsEmpty
is declared as:
And the Getter is public. In the base class System.Web.UI.WebControls.Style it is:
So there is not any problem with the current Telerik Web.UI suite.
From the exception it seems that you use assembly RadInput, which is prior the 2007 version of the controls. It is from the classic suite not supported in years.
In the classic controls in 2007/10/14 , the code was like:
But and at this time the .net 2.0 was the latest version of .NET
What probably happened is that you upgraded your framework to .NET 3.0 or later during the conversion of your project in VS 2013.
If you force your application to compile in .NET 2.0 it should continue to work, as before the conversion. Not sure if it is possible. See this thread:
If you need to use newer framework I would suggest you to upgrade to newer version of the RadControls as well.
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