CLASS libraries in C#

Hi  am new to .net. so having this basic doubt. In C programming all .c files are compiled to get .o file. as output. the object file. Similarly for C# Class files what is the output generated, When i compile as csproj which has only class files, I dont see any dll files as output. Where can I check what is the issue. Should i cmpile it in visual studio and see if dll is present in my home directory, or if i build this project using TFS, in teh drop folder i see blank. I do not see the dll. Should DLL be created or no?