Declaring Interfaces : Class « Development « ASP.NET Tutorial

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2. Development
3. Class

An interface is a list of properties and methods that a class must implement. 

public interface IProduct
{
    decimal Price
    {
        get;
    }

    void SaveProduct();
}

public class MusicProduct : IProduct
{
    public decimal Price
    {
        get { return 12.99m; }
    }

    public void SaveProduct()
    {
        // Save Music Product
    }
}

public class BookProduct : IProduct
{
    public decimal Price
    {
        get { return 23.99m; }
    }

    public void SaveProduct()
    {

        // Save Book Product
    }
}