FileUpload上传文件时我想在改变或浏览后，用image显示图片，怎么做？下面是我的代码：

public static Boolean FileUpload(HttpPostedFile postFile)
{
HttpPostedFile file =postFile;//调用标准类库，方法
int contentLength = file.ContentLength;//文件长度
string fileType = Path.GetExtension(file.FileName);

if (string.Compare(fileType,".rar",true)!=0)//判断上传文件的类型
return false;

if (contentLength > 10240000)//上传文件必须小于10M
return false;

try
{
string fileFullName = Path.GetFileName(file.FileName);//带扩展名的文件名
string fileName = Path.GetFileNameWithoutExtension(file.FileName);//同上，不带扩展名
HttpRequest request = System.Web.HttpContext.Current.Request;
string uploadPath =request.MapPath("..\\Download\\DownloadFile\\" + fileFullName);//上传路径
FileStream fs = new FileStream(uploadPath, FileMode.Create);//如果存在则覆盖原来文件
BinaryWriter bw = new BinaryWriter(fs);
byte[] buffer = new Byte[10000];//确定数据包大小

while (contentLength > 0)
{
int length = file.InputStream.Read(buffer, 0, 10000);
bw.Write(buffer, 0, length);
buffer = new Byte[10000];
contentLength -= length;
}

fs.Close();
bw.Close();
return true;
}
catch (Exception ex)
{
return false;
}
}