CSharp - Method Partial methods

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Introduction

A partial type may contain partial methods.

For example: 

partial class MyClass    
{
       ...
       partial void MyMethod (decimal amount);
}

partial class MyClass  
{
       ...
       partial void MyMethod (decimal amount)
       {
         if (amount > 100)
           ...
       }
}

A partial method consists of two parts: a definition and an implementation.

If an implementation is not provided, the definition of the partial method is compiled away.

Partial methods must be void and are implicitly private.