一章：概述（Part 1）

c#是一种区分大小写的语言。

采用命令行CSC.EXE 编译程序。

IDisposable模式

C#中的昂贵资源比如打开文件的句柄，连接数据库等，都需要通过手工调用IDisposable.Dispose()去释放。并且using语句可以帮助用户及时调用Dispose方法。

等于在try..catch块中finally中调用该方法。

public class Demo : IDisposable
{

private bool disposed = false;
#region IDisposable Members

public void Dispose()
{
//the value is true means the dispose method is called by user directly.
Dispose(true);

//This object will be cleaned up by the Dispose method. Therefore, you should call GC.SupressFinalize to take this object
//off the finalization queue and prevent finalization code for this object from executing a second time.
GC.SuppressFinalize(this);
}

private void Dispose(bool disposing)
{
if (disposed)
{
return;
}
if (disposing)
{
//release managed resources.

}
//release unmanaged resources

disposed = true;
}

~Demo()
{
Dispose(false);
}
#endregion
}