BUG: You receive a "CS1519" compiler error code when you use surrogate characters as a token in Visual C# .NET (814824)

MORE INFORMATION

A surrogate pair is a coded character representation for a single abstract character is made up of a sequence of two code units. The first unit of the pair is a high-surrogate (U+D800 through U+DBFF) and the second is a low-surrogate (U+DC00 through U+DFFF).

The Visual C# .NET or Visual C# 2005 compiler does not support surrogate Unicode characters as a token name.

Steps to Reproduce the Behavior

1. Start Notepad, and then paste the following code:

   using System;
   using System.Threading;
   using System.Globalization;
   
   namespace application1
   { 
   	class SurrogateTest
   	{
   		public static string \u20105()
   		{
   		  return "\u20105";
   		}
   		public static void Main(String[] args) 
   		{
   		  Console.WriteLine ("Function return: {0}", \u20105());
   		}
   	}
   }

2. Save the file as Surrogate_Unicode_test.cs.
3. Open a Visual Studio .NET 2002 command prompt or Visual Studio 2005 command prompt.
4. Type csc Surrogate_Unicode_test.cs to compile the file.
5. You may receive the error message that is described in the "Symptoms" section of this article.