How do you implement multiple inheritance in C#?

In C#, multiple inheritance is not directly supported as it can lead to various complexities and ambiguities, especially in terms of method resolution and diamond problem. However, you can achieve a similar effect using interfaces and abstract classes. Here's how:

1. Interfaces: Interfaces in C# define a contract that classes can implement. Multiple interfaces can be implemented by a single class.

interface Interface1
{
    void Method1();
}

interface Interface2
{
    void Method2();
}

interface Interface3
{
    void Method3();
}

class MyClass : Interface1, Interface2, Interface3
{
    public void Method1()
    {
        // Implementation of Method1
    }

    public void Method2()
    {
        // Implementation of Method2
    }

    public void Method3()
    {
        // Implementation of Method3
    }
}

2. Abstract Classes: Abstract classes can provide partial implementations of methods and can be used for inheritance.

abstract class AbstractClass1
{
    public abstract void Method1();
}

abstract class AbstractClass2
{
    public abstract void Method2();
}

class MyClass : AbstractClass1, AbstractClass2
{
    public override void Method1()
    {
        // Implementation of Method1
    }

    public override void Method2()
    {
        // Implementation of Method2
    }
}

By utilizing interfaces and abstract classes, you can simulate multiple inheritance to achieve the desired behavior in your C# programs. However, it's essential to design your classes and interfaces carefully to avoid complexities and maintain code clarity.