I've found some videos that explain C# but it back to C#.NET when it is first appeared, if I learn from these videos will I learn something that has been removed from the language? will I miss alot? 
Is it ok to learn from C# 2002 materials?
c#
Whatever you find, it should start at C#/.NET 2.0.  Much of .NET 1.0 was refined in 2.0 with generics, and the 2.0 framework is still widely used today; the 3.0 and 3.5 frameworks are enhancements to 2.0, not rewrites. If you're looking for a beginner book, Head First C# is pretty good.