ASP.NET C# 從資料庫(MSSQL)讀出圖檔

cmd.CommandText = "SELECT  picture , filename FROM pic ";

SqlDataReader dr = cmd.ExecuteReader();

byte[] img = null;

while (dr.Read())
{
  MyData data = new MyData();

  img = (byte[]) dr["picture"];

  MemoryStream str = new MemoryStream();

  str.Write(img, 0, img.Length);

  Bitmap bit = new Bitmap(str);

  data.img = bit;

  data.filename = (string) dr["filename"];

  myDataList.Add(data);

}