Controls :: Add Binary File From Database To Zip File Using Dotnetzip Using C#

i have table and i save image into table format binarry,but i want zip this image that user can download multiple image from website

i wrrite this code but this code download one image......
 
//string name = item.Name;
//string contentType = item.FormatImg;
//Byte[] data = (Byte[])item.Image;
//// Send the file to the browser
//Response.AddHeader("Content-type", contentType);
//Response.AddHeader("Content-Disposition", "attachment; filename=" + name);
//Response.BinaryWrite(data);
//Response.Flush();
//Response.End();