public byte[] GetPictureData(string imagepath)
        {
            ////根據圖片文件的路徑使用文件流打開，并保存為byte[]  
            FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重載方法
            byte[] byData = new byte[fs.Length];
            fs.Read(byData, 0, byData.Length);
            fs.Close();
            return byData;
        }

public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)
        {
            //將Image轉換成流數據，并保存為byte[]  
            MemoryStream mstream = new MemoryStream();
            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
            byte[] byData = new Byte[mstream.Length];
            mstream.Position = 0;
            mstream.Read(byData, 0, byData.Length);
            mstream.Close();
            return byData;
        }

public System.Drawing.Image ReturnPhoto(byte[] streamByte)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte);
            System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
            return img;
        }

public void WritePhoto(byte[] streamByte)
        {
            // Response.ContentType 的默認值為默認值為“text/html”
            Response.ContentType = "image/GIF";
            //圖片輸出的類型有: image/GIF  image/JPEG
            Response.BinaryWrite(streamByte);
        }

Response.ContentType = "application/msword";
Response.ContentType = "application/x-shockwave-flash";
Response.ContentType = "application/vnd.ms-excel";

switch (dataread("document_type"))
            {
                case "doc":
                    Response.ContentType = "application/msword";
                case "swf":
                    Response.ContentType = "application/x-shockwave-flash";
                case "xls":
                    Response.ContentType = "application/vnd.ms-excel";
                case "gif":
                    Response.ContentType = "image/gif";
                case "Jpg":
                    Response.ContentType = "image/jpeg";
            }

Image image= GetImageFromClipboard();//實現從剪切板獲取圖像的功能
System.IO.MemoryStream stream = new System.IO.MemoryStream();
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter formatter
= new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter(); formatter.Serialize(stream, image);

FileStream fs=new FileStream("xx",FileMode.Open,FileAccess.Write);
fs.Write(stream.ToArray(),0,stream.ToArray().Length);