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//µÃµ½Óû§ÒªÉÏ´«µÄÎļþÃû
string strFilePathName = loFile.PostedFile.FileName;
string strFileName = Path.GetFileName(strFilePathName);
int FileLength = loFile.PostedFile.ContentLength;
if(FileLength<=0)
return;
try
{
Byte[] FileByteArray = new Byte[FileLength]; //ͼÏóÎļþÁÙʱ´¢´æByteÊý×é
Stream StreamObject = loFile.PostedFile.InputStream; //½¨Á¢Êý¾ÝÁ÷¶ÔÏñ
//¶ÁȡͼÏóÎļþÊý¾Ý£¬FileByteArrayΪÊý¾Ý´¢´æÌ壬0ΪÊý¾ÝÖ¸ÕëλÖá¢FileLnegthΪÊý¾Ý³¤¶È
StreamObject.Read(FileByteArray,0,FileLength);
string fileName = Server.MapPath(".\\WriteXml.xml"); //Òª´ò¿ªµÄÎļþ

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(fileName);
XmlNode root=xmlDoc.SelectSingleNode("dbImage");//²éÕÒ<dbGuest>
XmlNodeList xnl=xmlDoc.SelectSingleNode("dbImage").ChildNodes;
int nIndex = xnl.Count;
//ÒÔÏÂÌí¼Óнáµã
XmlElement xe1=xmlDoc.CreateElement("Image");//´´½¨Ò»¸ö<User>½Úµã
XmlElement xesub1=xmlDoc.CreateElement("ImageID");
xesub1.InnerText=nIndex.ToString();//ÉèÖÃÎı¾½Úµã
xe1.AppendChild(xesub1);//Ìí¼Óµ½<User>½ÚµãÖÐ
XmlElement xesub2=xmlDoc.CreateElement("ImageContentType");
xesub2.InnerText=loFile.PostedFile.ContentType;
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("ImageSize");
xesub3.InnerText=FileLength.ToString();
xe1.AppendChild(xesub3);
XmlElement xesub4=xmlDoc.CreateElement("ImageDescription");
xesub4.InnerText=tbDescription.Text;
xe1.AppendChild(xesub4);
XmlElement xesub5=xmlDoc.CreateElement("ImageData