In C#, access modifiers are used to control the visibility and accessibility

of class members (fields, methods, properties, events, etc.) from other parts

of the program.

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C# has the following access modifiers:

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`public`: The public modifier makes a member accessible from anywhere in the 

program, including outside the class where it is defined.

​

`private`: The private modifier makes a member accessible only within the class

where it is defined.

​

`protected`: The protected modifier makes a member accessible within the class 

where it is defined and any derived classes.

​

`internal`: The internal modifier makes a member accessible within the same

assembly (DLL) where it is defined.

'Combination Modifier'| 'Description'

  protected internal    member is accessible to all class that extends

                        the given class and all other classes in the same

                        assembly

  private protected     accessible by types derived from the conataining 

                        class, but only within its countaining assembly