App_Code/Class1.cs

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

namespace SimpleExam.App_Code
{
    public class Class1
    {

        public static string connstring = ConfigurationManager.AppSettings["ConnectionString"];  //设置连接数据库的代码是webconfig里面的cn那句,即:server=.;database=net05qingongzhuxue;uid=sa;pwd=;
        public static DataSet GDS(string sql)
        {
            //OleDbDataAdapter dap = new OleDbDataAdapter(sql, connstring);
            SqlDataAdapter dap = new SqlDataAdapter(sql, connstring);
            DataSet ds = new DataSet();
            dap.Fill(ds);
            return ds;
        }
        public static void Dsql(string sql)
        {
            //  OleDbConnection conn = new OleDbConnection();
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = connstring;
            conn.Open();
            //  OleDbCommand cmd = new OleDbCommand(sql, conn);
            SqlCommand cmd = new SqlCommand(sql, conn);
            cmd.ExecuteNonQuery();
            conn.Close();
        }
        public int hsgexucute(string sql)  //自定义函数:执行sql语句,如果执行成功,返回值1,否则0
        {
            //myConnection.Open();


            SqlConnection conn = new SqlConnection();   //定义新数据库连接
            conn.ConnectionString = connstring;  //设置该新连接字符串是connstr,即上面的webconfig里的cn值
            SqlCommand myCommand = new SqlCommand(sql, conn); //设置新执行命令

            // SqlCommand cmd = new SqlCommand(sql, conn); 


            try
            {
                conn.Open();  //打开数据库连接
                myCommand.ExecuteNonQuery(); //执行sql语句
                return 1;  //执行成功,返回1
            }
            catch
            {
                //Console.WriteLine("SqlException:{0}",SQLexc);
                return 0;  //执行失败,返回0

            }
            finally
            {
                conn.Close(); //关闭数据库连接