Before the development of .net technology following technology wheir used

• OLE Technology(object linking and embeding)
• COM Technology (common object and model)
• .NET Technology

OLE TECHNOLOGY

• it is developed in early 90’s
• it is used for interproces commounication
• it provides features such as embed the documents.
• it enable to one app to manipulated objected into another app

for ex.:- word and excel

COM Technology

• it provided inter module commounication
• in this technology monolithic approch is avoid in this technology
• when programmers becomes large it create complexity to over come this problem com technology is used whier different modules are created for dividing a large problem into modules

it provides following features

• it reduces complexity of software
• it enable distributed development
• inhances software mantain ability

.NET Technology

• it is used for intersite commounication
• it is a third generation model
• it produces machine inter operable data that is called MSIL (Microsoft Intermeted Language)
• it also called meta data