如何把二进制图片读取到image控件

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 //SQLHelper.cs
 //从数据库中读取image类型图片并且显示到控件上
        public bool ShowImage(string sql, System.Web.UI.WebControls.Image img1)
        {
            SqlConnection imgConn = new SqlConnection(connectionString);
            try
            {
                SqlCommand cmd = new SqlCommand(sql, imgConn);
                imgConn.Open();
                byte[] b = (byte[])cmd.ExecuteScalar();
                if (b.Length > 0)
                {
                    MemoryStream stream = new MemoryStream(b, true);
                    stream.Write(b, 0, b.Length);
                    Image img = Image.FromStream(stream);
                    //img.ImageUrl = new System.Drawing.Bitmap(stream);
                    stream.Close();
                }
                return true;
            }
            catch
            {
                img1 = null;
                return false;
            }
            finally
            {
                imgConn.Close();
            }
        }

//后台
//显示图片
 sp.ShowImage("Select Photo From Description1 Where id='" +this.id.Text + "'", imgphoto);

http://bbs.csdn.net/topics/220027818

http://blog.csdn.net/qingheshijiyuan/article/details/48737069