//--------------WebDAV删除代码-----
private void WebDAVDel_Click(object sender, EventArgs e)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(@"http://10.57.144.2/WebDAV/Powerpoint.pptx");
//req.Credentials = new NetworkCredential("Administrator", "123456");
req.PreAuthenticate = true;
req.Method = "DELETE";
//req.AllowWriteStreamBuffering = true;
req.GetResponse();
}