add a private method to a class in csharp

To add a private method to a class in C#, you simply declare the method as private within the class declaration. Here's an example:

main.cs
public class MyClass
{
    // public method
    public void PublicMethod()
    {
        // can call private method
        PrivateMethod();
    }

    // private method
    private void PrivateMethod()
    {
        // implementation details here
    }
}
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In this example, MyClass has a public method called PublicMethod, which can be accessed from outside the class. Within PublicMethod, we can call the private method PrivateMethod, which can only be accessed from within the class.

By declaring PrivateMethod as private, we are using the principle of encapsulation to hide implementation details and ensure that the method is only used within the context of the class. This can help to prevent bugs and improve the maintainability of our code.