public void GetFilesByOrder(string Order_ID, string IntNumber)
{
MemoryStream ms = new MemoryStream();
byte[] buffer = null;

List<MaterialInfo> mList = mBll.SelectEntitys(m => m.Owner_ID == Order_ID);

using (ZipFile file = ZipFile.Create(ms))
{
file.BeginUpdate();
foreach (var item in mList)
{
UrlDataSource data = new UrlDataSource(CommonData.ApiFilePathBase + "Order/" + item.SaveName);
file.Add(data, item.Name);
}
file.CommitUpdate();
buffer = new byte[ms.Length];
ms.Position = 0;
ms.Read(buffer, 0, buffer.Length);
}
Response.AddHeader("content-disposition", "attachment;filename=" + IntNumber + ".zip");
Response.BinaryWrite(buffer);
Response.Flush();
Response.End();
}

public class UrlDataSource : IStaticDataSource
{
public string Url { get; set; }

public UrlDataSource(string url)
{
this.Url = url;
}

public Stream GetSource()
{
return GetStreamUrl();
}
public Stream GetStreamUrl()
{
try
{
WebRequest req = WebRequest.Create(Url);
WebResponse result = req.GetResponse();

MemoryStream ms = new MemoryStream();
result.GetResponseStream().CopyTo(ms);

ms.Position = 0;
return ms;
}
catch
{
}
return null;
}
}