These days I have learned some basic usage of C#. I think that because C# is often used in application programming ,we should practice the language in an engineering way rather than solving some algorithmic problems. But what is the best way to practice C# if I cannot find any projects related to the language in the work.
I think you can try start with personal small utilities. For example, write a file backuper, personal asp.net blog site, password reminder, time tracker, etc..
the product will be used by you, so you will get exceptions or performance problems so you will be learning more..