App_Code/Class1.cs

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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;
/// <summary>
/// Class1 的摘要说明
/// </summary>
public class Class1
{
	public Class1()
	{
		// 下载于www.51aspx.com
		// TODO: 在此处添加构造函数逻辑
		//
	}
    public static SqlConnection DBconnection()
    {

        return new SqlConnection("server=.\\SQL2005;database=ClassRoom;uid=sa;pwd=sasasa;Max Pool Size = 512");

    }
    public static DataTable ExecSel(string sql)
    {
        SqlConnection con = Class1.DBconnection();
        con.Open();
        SqlCommand com = new SqlCommand(sql, con);
        SqlDataAdapter oda = new SqlDataAdapter();
        DataSet ds = new DataSet();
        oda.SelectCommand = com;
        oda.Fill(ds);
        ds.Dispose();
        con.Close();
        con.Dispose();
        com.Dispose();
        return ds.Tables[0];

    }
    public static string SelOne(string sql)
    {
        SqlConnection con = Class1.DBconnection();
        con.Open();
        SqlCommand com = new SqlCommand(sql, con);
        return com.ExecuteScalar().ToString();
        con.Close();
        con.Dispose();
        com.Dispose();
    }
    public static void ExecSql(string sql)
    {
        SqlConnection con = Class1.DBconnection();
        con.Open();
        SqlCommand com = new SqlCommand(sql, con);
        com.ExecuteNonQuery();
        con.Close();