把RichTextBox中的文本保存到Sql Server中

保存：

    private void btnSave_Click(object sender, System.EventArgs e)
        {
            
            FileStream stream = null;
            SqlConnection conn = null;
            SqlCommand cmd = null;
            try
            {
                richTextBox1.SaveFile( "temp.rtf" );
                stream = new FileStream("temp.rtf", FileMode.Open, FileAccess.Read);
                int size = Convert.ToInt32(stream.Length);
                Byte[] rtf = new Byte[size];
                stream.Read(rtf, 0, size);

                conn = new SqlConnection("Database=Northwind;Integrated Security=true;");
                conn.Open();
                cmd = new SqlCommand("UPDATE Employees SET Photo=@Photo WHERE EmployeeID=1", conn);

                SqlParameter paramRTF = 
                    new SqlParameter("@Photo",
                    SqlDbType.Image,
                    rtf.Length,
                    ParameterDirection.Input,
                    false,
                    0,0,null,
                    DataRowVersion.Current,
                    rtf);
                cmd.Parameters.Add(paramRTF);
    
                int rowsUpdated = Convert.ToInt32(cmd.ExecuteNonQuery());
                
                MessageBox.Show(String.Format("{0} rows updated", rowsUpdated));
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                if ( stream != null ) stream.Close();
                if (cmd != null ) cmd.Parameters.Clear();
                if (conn != null) conn.Close();
            }
        }

读取：

private void btnLoad_Click(object sender, System.EventArgs e)
        {
            richTextBox1.Clear();

            SqlConnection cn     = null;
            SqlCommand cmd       = null;
            SqlDataReader reader = null;
            try
            {
                cn = new SqlConnection("Database=Northwind;Integrated Security=true;");
                cn.Open();
                cmd = new SqlCommand("SELECT Photo FROM Employees WHERE EmployeeID=1", cn);
                reader = cmd.ExecuteReader();
                reader.Read();
                if (reader.HasRows)
                {
                    if (!reader.IsDBNull(0))
                    {
                        Byte[] rtf = new Byte[Convert.ToInt32((reader.GetBytes(0, 0, null, 0, Int32.MaxValue)))];
                        long bytesReceived = reader.GetBytes(0, 0, rtf, 0, rtf.Length);
  
                        ASCIIEncoding encoding = new ASCIIEncoding();
                        richTextBox1.Rtf = encoding.GetString(rtf, 0, Convert.ToInt32(bytesReceived));
                    }
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                if (reader != null ) reader.Close();
                if (cn != null ) cn.Close();
            }

        }