関連ワード:  what is framework class library    what is framework class library in .net    what is base class library in .net    what is base class library    what is base class library in c#    what is dotnet framework class library    what is meant by .net framework class library    what is the purpose of the .net framework class library    what is the purpose of the .net framework class library fcl    what is the difference between framework and class library