c# 高手请进 求c#的注释

这是一道c#的题。请将它的注释加上。谢谢哦。

程序，这样一个大学书店可以用它来记录和确定教科书的零售价。所有计算应该用一个类TextBook的实例来完成。这个类应该具有属性Tile，Author，Cost（批发价），Quantity(库存的数量)和方法Price(零售价)。假使这个书店将书价标高了25%，Price就应该是Cost的1.25倍。

using System;
using System.windows.Forms;
public class textbox
{
private string t;
private string a;
private demial c;
private int q;
public textbox(string tile,string author,demial cost, int quantity )
{
t=tile;
a=author;
c=cost;
q=quantity;
}
public string Tile
{
set{t=value;}get{return t;}
}
public string Author
{
set{a=value;}get{return a;}

}
public demial Cost
{
set {c=value;}get{return c;}
}
public int Quantity
{
set{q=value;}get{return q;}
}
public demial Price()
{
retun Cost*1.25;

using System; //名词空间
using System.windows.Forms; //窗体类
public class textbox //定义textbox类
{
private string t;
private string a;
private demial c;
private int q;
public textbox(string tile,string author,demial cost, int quantity ) //构造函数
{
t=tile;
a=author;
c=cost;
q=quantity;
}
public string Tile
{
set{t=value;}get{return t;}
}
public string Author
{
set{a=value;}get{return a;}

}
public demial Cost
{
set {c=value;}get{return c;}
}
public int Quantity
{
set{q=value;}get{return q;}
}
public demial Price()
{
retun Cost*1.25;

}
static void Main()
{ private string output="";
textbox bookshop=new textbox(string tile,string author,demial cost, int quantity )；
output+=string.format("{0}零售价为{1}",Tile+Author+Cost+Quantity,Pric()）；