what is diffrence among these:1)Turbo C++,2)Visual C++,3)Borland C++,4)Linux C++?

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I've got another doubt too, what's the difference between c++ and c#?

What is c# actually?Is it a failure?
And also what is a C++ Builder?

Which one is important and univerally used?

[Arith]

turbo/visual/borland/linux C are all more or less the same thing. Turbo C++ is actually by Borland. It's basically a compliment of tools/compiler to write programs. Think of those four you listed like bmw/gmc/volkswagen etc..

C# is kind of an offshoot of C++ language. The syntax (the "words" of the language) is slightly different, though largely the same. It's not a failure, just a matter of choice of what language you go with.