c# winform下sql圖片二進制存儲/讀取/顯示/寫入XML/讀取XML顯示

winform下：
        //存儲

        private void MemoryImage()
        {
            string sql = "";
            //string conn = "Provider=SQLNCLI;Data Source=192.168.0.9,1433;Database=WebDown;UID=sa;PWD=111122;";

            Stream ms;
            byte[] picbyte;
            OpenFileDialog fdSelectPic = new OpenFileDialog();
            if (ofdSelectPic.ShowDialog() == DialogResult.OK)
            {
                if ((ms = ofdSelectPic.OpenFile()) != null)
                {
                    picbyte = new byte[ms.Length];
                    ms.Position = 0;
                    ms.Read(picbyte, 0, Convert.ToInt32(ms.Length));

                    //連接數據庫
                    SqlConnection conn = new SqlConnection();
                    conn.ConnectionString = "Data Source=192.168.0.9,1433;Database=WebDown;UID=sa;PWD=111122;";

                    sql = "Insert into LibraryCover(Cover) values(@UpdateImage)";
                    SqlCommand cmd = new SqlCommand(sql, conn);

                    cmd.Parameters.Add("@UpdateImage", SqlDbType.VarBinary);
                    cmd.Parameters["@UpdateImage"].Value = picbyte;

                    conn.Open();
                    cmd.ExecuteNonQuery();
                    conn.Close();

                    ms.Close();
                }
            }

            MessageBox.Show("完成！");
        }
        //讀取

        private void ShowImage()
        {
            string sql = "";
&nb