帮我注释一下吧
 

  帮我把下面这段代码注释一吧 谢谢大家了  

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
//该源码首发自www.51aspx.com(５１aｓpｘ．ｃｏｍ)

/// <summary>
/// SqlHelper 的摘要说明
/// </summary>
public class SqlHelper
{
  private static readonly string strConn = ConfigurationManager.ConnectionStrings["TangCompanyConn"].ConnectionString;
  private static readonly string strName = ConfigurationManager.AppSettings["userName"].ToString();
  private static readonly string strPass = ConfigurationManager.AppSettings["userPass"].ToString();
public SqlHelper()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
  public static SqlDataReader ExcuteRead(string nText, CommandType nType, SqlParameter[] paras) {

  SqlConnection conn = new SqlConnection(strConn);
  SqlCommand cmd = new SqlCommand();
  try
  {
  PrepareCommand(conn, cmd, null, nType, nText, paras);
  SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
  cmd.Parameters.Clear();
  return dr;
   
  }
  catch(SqlException ex){

  throw new Exception(ex.Message, ex);
   
  }
   
  }
  public static int ExcuteNonQurey(string nText, CommandType nType, SqlParameter[] paras) {

  SqlCommand cmd = new SqlCommand();
  using (SqlConnection conn = new SqlConnection(strConn)) {

  PrepareCommand(conn, cmd, null, nType, nText, paras);
  int rows = cmd.ExecuteNonQuery();
  cmd.Parameters.Clear();
  return rows;
   
  }
   
  }
  public static object ExcuteSclare(string nText, CommandType nType, SqlParameter[] paras) {

  SqlCommand cmd = new SqlCommand();
  using (SqlConnection conn = new SqlConnection(strConn)) {

  PrepareCommand(conn, cmd, null, nType, nText, paras);
  object obj = cmd.ExecuteScalar();
  cmd.Parameters.Clear();
  return obj;
  }
   
  }
  public static DataSet ExcuteReadApdater(string nText, CommandType nType, SqlParameter[] paras) {

  SqlConnection con = new SqlConnection(strConn);
  SqlCommand cmd = new SqlCommand();
  DataSet ds = new DataSet();
  try
  {
  PrepareCommand(con, cmd, null, nType, nText, paras);
  SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
  sqlAdapter.Fill(ds);
  cmd.Parameters.Clear();
  return ds;

  }
  catch (SqlException ex) {

  throw new Exception(ex.Message, ex);
   
  }  
  }
  public static void PrepareCommand(SqlConnection con, SqlCommand cmd, SqlTransaction trans, CommandType nType, string nText, SqlParameter[] paras) {

  if (con.State != ConnectionState.Open)
  con.Open();
  cmd.Connection = con;