public static string SaveImageAsync(AsyncFileUpload Fu, string prefix, string localImagePath)
{
if (!Directory.Exists(localImagePath))
Directory.CreateDirectory(localImagePath);
string strImage = string.Empty;
string SavePath = string.Empty;
//SavePath = GetImagePathWithFileName(3, prefix, localImagePath);
SavePath = localImagePath;
SavePath += '\\' + prefix;
Fu.SaveAs(SavePath);
Fu.FileContent.Dispose();
strImage = SavePath;
//Fu.PostedFile.ContentLength
return strImage;
}