App_Code/SqlData.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;

public class SqlData
{
    private SqlConnection con;
    private SqlCommand cmd;
    private SqlDataAdapter da;    

    public SqlData()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
        con = new SqlConnection(ConfigurationManager.AppSettings["ConnenctionStr"]);
       
    }
    // 下载于www.51aspx.com 

    public bool ExecuteSQL(string str)
    {
        if (con.State == ConnectionState.Closed)
            con.Open();
        cmd = new SqlCommand(str, con);
        try
        {
            cmd.ExecuteNonQuery();
            return true;
        }
        catch (Exception e)
        {
            throw (new Exception(e.Message));
            return false;
        }

        finally
        {
            con.Close();
        }
    }


    public DataSet ExecuteDateSet(string str)
    {
        if (con.State == ConnectionState.Closed)
            con.Open();
        try
        {
            cmd = new SqlCommand(str, con);
            da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();