SqlHelper.cs

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

namespace KeWeb
{
    public static class  SqlHelper
    {
        public static readonly string connstr =
            ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;

        public static SqlConnection OpenConnection()
        {
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            return conn;
        }

        public static int ExecuteNonQuery(string cmdText,
            params SqlParameter[] parameters)
        {
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                conn.Open();
                return ExecuteNonQuery(conn, cmdText, parameters);
            }
        }

        public static object ExecuteScalar(string cmdText,
            params SqlParameter[] parameters)
        {
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                conn.Open();
                return ExecuteScalar(conn, cmdText, parameters);
            }
        }

        public static DataTable ExecuteDataTable(string cmdText,
            params SqlParameter[] parameters)
        {
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                conn.Open();
                return ExecuteDataTable(conn, cmdText, parameters);
            }
        }

        public static int ExecuteNonQuery(SqlConnection conn,string cmdText,
           params SqlParameter[] parameters)
        {
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = cmdText;
                cmd.Parameters.AddRange(parameters);
                return cmd.ExecuteNonQuery();