When the DBHelper asp.net programming

Mar 7 posted in DotNet (RSS), comments.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace DAL
{
    public class SQLHelper
    {
        private SqlConnection conn = null;
        private SqlCommand cmd = null;
        private SqlDataReader sdr = null;
        public SQLHelper()
        {
            string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
            conn = new SqlConnection(connStr);
        }

        private SqlConnection GetConn()
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }
            if (conn.State == ConnectionState.Broken)
            {
                conn.Open();
            }
            if (conn == null)
            {
                conn.Open();
            }
            return conn;
        }

        /// <summary>
        ///   Is executed without parameters to add to an SQL statement or stored procedure  
        /// </summary>
        /// <param name="cmdText"> Additions to the SQL statement or stored procedure  </param>
        /// <param name="ct"> Command type  </param>
        /// <returns></returns>
        public int ExecuteNonQuery(string cmdText, CommandType ct)
        {
            int res;
            try
            {
                cmd = new SqlCommand(cmdText, GetConn());
                cmd.CommandType = ct;
                res = cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
            return res;
        }

        /// <summary>
        ///   Execute the parameterized additions to SQL statements or stored procedures  
        /// </summary>
        /// <param name="cmdText"> Additions to the SQL statement or stored procedure  </param>
        /// <param name="ct"> Command type  </param>
        /// <returns></returns>
        public int ExecuteNonQuery(string cmdText, SqlParameter[] paras, CommandType ct)
        {
            int res;
            using (cmd = new SqlCommand(cmdText, GetConn()))
            {
                cmd.CommandType = ct;
                cmd.Parameters.AddRange(paras);
                res = cmd.ExecuteNonQuery();
            }
            return res;
        }

        /// <summary>
        ///   Executing a query the SQL statement or stored procedure  
        /// </summary>
        /// <param name="cmdText"> Query the SQL statement or stored procedure  </param>
        /// <param name="ct"> Command type  </param>
        /// <returns></returns>
        public DataTable ExecuteQuery(string cmdText, CommandType ct)
        {
            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdText, GetConn());
            cmd.CommandType = ct;
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }

        /// <summary>
        ///   Execute the parameterized query SQL statement or stored procedure  
        /// </summary>
        /// <param name="cmdText"> Query the SQL statement or stored procedure  </param>
        /// <param name="paras"> Parameters collection  </param>
        /// <param name="ct"> Command type  </param>
        /// <returns></returns>
        public DataTable ExecuteQuery(string cmdText, SqlParameter[] paras, CommandType ct)
        {
            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdText, GetConn());
            cmd.CommandType = ct;
            cmd.Parameters.AddRange(paras);
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }
    }
}