What is the main deferences between c# and java?

Answer 1

Java and C# languages have a common syntactic basis that provides a lot of common things. However, their features and application are different. To make this point clear, have a look at the useful article on this theme http://computoolsglobal.com/blog/java-vs-c/
All their peculiarities and differences are described, and presented in a comparison table.

Answer 2

I can't enumerate all of them but all I can say, based on my experience, C# is a much more simplified counterpart of Java.