Uploading Files in ASP.NET 2.0[转载】

Introduction

Ever since Microsoft ASP.NET was introduced with version 1.0, there has been the built-in means of building Web applications that had the ability to upload files to the hosting server. This was done through the use of the File Field HTML server control. I previously wrote an MSDN article on how to effectively use this control in your ASP.NET applications. This article is a reintroduction to the file upload process, but instead of using the File Field control, I will show you how to effectively use the new FileUpload server control that is offered through ASP.NET 2.0.

It is important to note that while this article introduces you to the new FileUpload server control, it is still quite possible to use the File Field control in your applications today.
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http://msdn.microsoft.com/asp.net/default.aspx?pull=/library/en-us/dnaspp/html/UploadASP2.asp