ASP.Net DBHelper

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 DBHelper
    {
        private static SqlConnection con;
        private static string conString = ConfigurationManager.ConnectionStrings["con"].ConnectionString;
        private static SqlConnection Con 
        {
            get 
            {
                if (con == null)
                {
                    con = new SqlConnection(conString);
                    con.Open();
                }
                else if (con.State == ConnectionState.Broken)
                {
                    con.Close();
                    con.Open();
                }
                else if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                }
                return con;
            }
        }
        private static SqlCommand Com 
        {
            get {
                return Con.CreateCommand();
            }
        }

        public static bool Update(string sql)
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            return cmd.ExecuteNonQuery() > 0;
        }
        public static bool Update(string sql,SqlParameter[] pars)
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            cmd.Parameters.AddRange(pars);
            return cmd.ExecuteNonQuery() > 0;
        }
        public static bool Update(string sql, SqlParameter[] pars,bool isNewCon,SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteNonQuery() > 0;
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteNonQuery() > 0;
            }
        }
        public static bool Update(string sql,bool isNewCon, SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                return cmd.ExecuteNonQuery() > 0;
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                return cmd.ExecuteNonQuery() > 0;
            }
        }

        public static object SelectForScalar(string sql) 
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            return cmd.ExecuteScalar();
        }
        public static object SelectForScalar(string sql,SqlParameter[] pars)
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            cmd.Parameters.AddRange(pars);
            return cmd.ExecuteScalar();
        }
        public static object SelectForScalar(string sql, SqlParameter[] pars,bool isNewCon,SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteScalar();
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteScalar();
            }
        }
        public static object SelectForScalar(string sql, bool isNewCon, SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                return cmd.ExecuteScalar();
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                return cmd.ExecuteScalar();
            }
        }

        public static SqlDataReader SelectForDataReader(string sql) 
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            return cmd.ExecuteReader();
        }
        public static SqlDataReader SelectForDataReader(string sql,SqlParameter[] pars)
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            cmd.Parameters.AddRange(pars);
            return cmd.ExecuteReader();
        }
        public static SqlDataReader SelectForDataReader(string sql, SqlParameter[] pars, bool isNewCon, SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteReader();
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(pars);
                return cmd.ExecuteReader();
            }
        }
        public static SqlDataReader SelectForDataReader(string sql, bool isNewCon, SqlConnection _con)
        {
            if (isNewCon)
            {
                _con = new SqlConnection(conString);
                _con.Open();
                SqlCommand cmd = _con.CreateCommand();
                cmd.CommandText = sql;
                return cmd.ExecuteReader();
            }
            else
            {
                SqlCommand cmd = Com;
                cmd.CommandText = sql;
                return cmd.ExecuteReader();
            }
        }
        public static bool UpdateProc(string sql, SqlParameter[] pars)
        {
            SqlCommand cmd = Com;
            cmd.CommandText = sql;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddRange(pars);
            return cmd.ExecuteNonQuery() > 0;
        }

    }
}

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