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if (this.myFile.PostedFile != null)
{
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if (!System.IO.Directory.Exists(Server.MapPath("~")+@"\photoes"))
{
      System.IO.Directory.CreateDirectory(Server.MapPath("~")+@"\photoes");
}
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if(!System.IO.Directory.Exists(Server.MapPath("~")+@"\photoes\"+userID))
{
     System.IO.Directory.CreateDirectory(Server.MapPath("~")+@"\photoes\"+userID)
}
string orignalName = this.myFile2.PostedFile.FileName;//»ñÈ¡¿Í»§»úÉÏ´«ÎļþµÄ·¾¶
int lastdotlocation = orignalName.LastIndexOf(".");
string extendName = orignalName.Substring(lastdotlocation);//»ñÈ¡À©Õ¹Ãû
 if (extendName != ".gif" && extendName != ".jpg" && extendName != ".jpeg" && extendName != ".png")
{
       Response.Write("Wrong format");
       Response.End();
}//¼ì²éÎļþ¸ñʽ
string newName = DateTime.Now.Millisecond.ToString() + "_" + myFile2.PostedFile.ContentLength.ToString() + extendName;//¶ÔÎļþ½øÐÐÖØÃüÃû
myFile.PostedFile.SaveAs(Server.MapPath("~") + @"\photoes\" +userID+@"\"+ newName);
}