c#继承构建错误

我是Stack Overflow的新手，也是一个新手程序员。我试图在Visual Studio 2010中构建c#其他人的代码作为学习机会。我无法弄清楚为什么我在四个类中得到以下三个错误(第50、59、67、&75)在附带的存根代码的底部(我从原始程序中剥离了与错误无关的所有内容):

<>之前1. " c_basic_object ">方法必须有返回类型2. :";预期3." (p_name) "类、结构或接口成员声明中的无效令牌')'4. " p_name ">类型或命名空间名称'p_name'无法找到(您是否缺少using指令或程序集引用?)之前

代码几乎与Andrew Troelsen的Pro c# 2005第4章中的Employee和Manager类相同。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace TestStub
{
class Program
{
    static void Main(string[] args)
    {
        String strTest1 = "This is a string #1";
        String strTest2 = "This is a string #2";
        c_basic_object objBasic = new c_basic_object(strTest1);
        Console.WriteLine(objBasic.m_name);
        c_abstract_button_widget objButton = new c_abstract_button_widget();
        Console.WriteLine("Test, Test, Test");
        Console.ReadKey(true);
        Console.WriteLine();
    }
}// End class Program
public class c_basic_object
{
    public string m_name = String.Empty;
    //Constructor  create_basic_object( p_name)
    public c_basic_object(string p_name)
    {
        m_name = p_name;
    }
    // create_basic_object
    //Constructor  construct_empty()
    public c_basic_object()
    {
    }
    // construct_empty
    //@ Destructor  Destroy()
    ~c_basic_object()
    {
    }
} // End class c_basic_object

// -- definitions only for the Virtual Abstract functions in the factory
public class c_abstract_button_widget: c_basic_object
{
    public c_basic_object(string p_name) : base(p_name)
    {
        //Console.WriteLine("Inside c_abstract_button_widget ");
    }
} // end c_abstract_button_widget
// c_abstract_button_widget
public class c_abstract_label_widget: c_basic_object
{
    public c_basic_object(string p_name) : base(p_name)
    {
    }
} // end c_abstract_label_widget
// c_abstract_label_widget
public class c_abstract_draw_surface_widget: c_basic_object
{
    public c_basic_object(string p_name) : base(p_name)
    {
    }
} // end c_abstract_draw_surface_widget
// c_abstract_draw_surface_widget
public class c_abstract_scrollbar_widget: c_basic_object
{
    public c_basic_object(string p_name) : base(p_name)
    {
    }
} // end c_abstract_scrollbar_widget
}// End namespace TestStub

public class c_abstract_button_widget: c_basic_object
{
    public c_basic_object(string p_name) : base(p_name)
    {
        //Console.WriteLine("Inside c_abstract_button_widget ");
    }
}

public class c_abstract_button_widget: c_basic_object
{
    public c_abstract_button_widget(string p_name) : base(p_name)
    {
        //Console.WriteLine("Inside c_abstract_button_widget ");
    }
}

public class c_abstract_button_widget: c_basic_object
{
    public c_abstract_button_widget(string p_name) : base(p_name)
    {
        //Console.WriteLine("Inside c_abstract_button_widget ");
    }
} 
public class c_abstract_label_widget: c_basic_object
{
    public c_abstract_label_widget(string p_name) : base(p_name)
    {
    }
} 
public class c_abstract_draw_surface_widget: c_basic_object
{
    public c_abstract_draw_surface_widget(string p_name) : base(p_name)
    {
    }
} 
public class c_abstract_scrollbar_widget: c_basic_object
{
    public c_abstract_scrollbar_widget(string p_name) : base(p_name)
    {
    }
}