限制图片上传大小

   protected void Button1_Click(object sender, EventArgs e)
        {
         
   if(File1.PostedFile.ContentType.ToUpper().IndexOf("IMAGE")>-1)
   {
    System.Drawing.Image img= System.Drawing.Image.FromStream(File1.PostedFile.InputStream);
    int Width = img.Width;
    int Height = img.Height;
    if(Width>60 || Height>60 || File1.PostedFile.ContentLength>1024*1024*2)
    {
     Response.Write("不符:Width="+Width.ToString() +"<br>Height="+Height.ToString()+"<br>Size="+(this.File1.PostedFile.ContentLength/1024).ToString("##,##0.00")+"K");
    }
    else
    {
     string sPath =Server.MapPath(System.DateTime.Now.ToString("yyy-MM-dd hh-mm-ss")+Session.SessionID+".jpg");
     this.File1.PostedFile.SaveAs(sPath);
     Response.Write("上传成功");
    }
   }
   else
   {
    Response.Write("请选择图片文件!");
   }
  }