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C# and Java are general purpose programming languages with which you can write most types of applications.
However, C# has more features than Java and it can therefore be easier to write some types of application using the former.
Wikipedia has a useful comparison between the two:
http://en.wikipedia.org/wiki/Comparison_of_C_Sharp_and_Java
0 1) Visual studio 6.0 good enough to learn c++ and visual basic.
2) To use c# you should install the advanced visual studio that came after visual studio 6.0 release
3) You are right. C# is the combination of Java & C++ [Borrowed good stuffs from both]. But c++ has its own advantages. Lot system side programmers like c++
4) You can have both visual studio 6.0 and later version in the same machine.
Note: To use c# install either one of the below
1) Visual Studio 2003
2) Visual Studio 2005
3) Visual Studio 2008
Or the Visual studio versions released later