add a protected static method to a class in csharp

To add a protected static method to a class in C#, you can simply declare the method as static and add the keyword protected before the method name. Here's an example:

main.cs
public class MyClass
{
   protected static void MyProtectedMethod()
   {
      // method logic here
   }
}
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In the example above, we've added a protected static method named MyProtectedMethod() to the MyClass class. This means that the method can only be accessed within the MyClass class and any derived classes.

Note that static methods are not instance-specific and can be called on the class itself (e.g. MyClass.MyProtectedMethod()) without the need for an instance of the class to be created.