C# Online Compiler | .NET Fiddle

using System;
using System.Reflection;

public class Animal
{
	
	
}
public class Cat : Animal{
	
}

public class Dog :Animal {
}

public class Snake : Animal{
	
}

public static class AnimalFactory{
	
	public static object CreateAnimal(string AnimalName){
	    Type type = Type.GetType(AnimalName);

        if (type != null)
        {
            // Create an instance of the class
            var instance = Activator.CreateInstance(type);
            return instance;
        }	
		return null;
	}
	
}


public static class Program
{
	
    static void Main()
    {
    		var snake = AnimalFactory.CreateAnimal("Snake");
			var dog = AnimalFactory.CreateAnimal("Dog");
			var cat = AnimalFactory.CreateAnimal("Cat");
		
			if(snake == null || dog == null || cat ==null ){
				Console.WriteLine("Unable to Create all objects");
				return;
			}
			Console.WriteLine("All objects created");
	}
}
Cached Result
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