Why must the base class be specified before interfaces when declaring a derived class?

Question

public interface ITest
{
    int ChildCount { get; set; }
}

public class Test
{
}

public class OrderPool : ITest, Test
{
    public int ChildCount
    {
        ge         


        

Answer 1

Simply because the language is designed like that. The reason is probably that a class can have only one base class, but implement any number of interfaces.