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What are partial classes?

  •  Derived classes focus more on important portions by splitting a class definition into multiple source files using partial classes. 
  •  In partial class code is hidden in a file named Form.Designer.vb or Form.Designer.cs. 
  •  Partial class files can be viewed by expending all files in solution explorer. 
  •  We can enhance and extend auto-generated code by using partial classes. 
  •  These multiple files get compiled into a single class during compilation.