The only major breakage has not been in the language, but in the .NET framework ...

		gpvos on June 25, 2012 \| parent \| context \| favorite \| on: What factors led to the development of C# in spite... The only major breakage has not been in the language, but in the .NET framework libraries; and then mostly in ASP.NET. Between 1.1 and 2.0, quite a few things broke there. Upgrading was no fun at all.