An interface is implemented  at class definition level by using the : (colon) operator  after the class name but before the interface name. Then, you must  provide concrete implementations of the methods of that interface. In Visual Studio,  this task is automated for you; so, you do not have to type out all the  methods. 
Steps:
- Type the classname.
-  Type the colon (:).
-  Type either Ctrl+Spaceor begin typing the interface name to bring up the IntelliSense menu. Select the interface name from the menu list.
-  Right click the interface name and select Implement Interfacefrom the popup menu.
 
Figure: Implementing an interface in Visual Studio  
 
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