图片上传并按比例缩小

在ASP.NET中上传图片并生成缩略图的C#源码usingSystem;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Web;usingSystem.Web.SessionState;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.HtmlContro