Rhino.TokenStream.IsAlpha C# (CSharp) Method

		private static bool IsAlpha(int c)
		{
			// Use 'Z' < 'a'
			if (c <= 'Z')
			{
				return 'A' <= c;
			}
			else
			{
				return 'a' <= c && c <= 'z';
			}
		}