App_Code/MyClass.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.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;

/// <summary>
///MyClass 的摘要说明
/// </summary>
public class MyClass
{
	public MyClass()
	{
		//
		//TODO: 在此处添加构造函数逻辑
		//
	}
    public static SqlConnection Connection()
    {
        SqlConnection sqlcon = new SqlConnection();
        sqlcon.ConnectionString = ConfigurationManager.ConnectionStrings["sqlconstr"].ConnectionString;
        sqlcon.Open();
        return sqlcon;
        sqlcon.Close();

    }
    public static int ExecuteSql(string sql)
    {
        //
        //SqlConnection sqlcon = new SqlConnection();
        // sqlcon.ConnectionString = ConfigurationManager.ConnectionStrings["sqlconstr"].ConnectionString;
        // sqlcon.Open();
        SqlConnection sqlcon = MyClass.Connection();
        SqlCommand cmd = new SqlCommand(sql, sqlcon);
        int n = cmd.ExecuteNonQuery();
        return n;

       // sqlcon.Close();
    }
    public static SqlDataReader ExecuteRead(string sql)
    {
        SqlConnection sqlcon = new SqlConnection();
        sqlcon.ConnectionString = ConfigurationManager.ConnectionStrings["sqlconstr"].ConnectionString;
        sqlcon.Open();



        SqlCommand cmd = new SqlCommand(sql, sqlcon);

        SqlDataReader dr = cmd.ExecuteReader();

        return dr;

        sqlcon.Close();
    }