ASP.NET和SQL数据库连接的问题···

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class fuliguanli_add : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
		if (!IsPostBack)
        {
			// xingbie.Items.Add("male"); 
			// xingbie.Items.Add("female");
			// addxiala("kehuxinxi","bianhao","kehubianhao");
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string sql;
        sql="insert into fuliguanli(fulibianhao,fulimingcheng,fuliedu,fulineirong) values('"+fulibianhao.Text.ToString().Trim()+"','"+fulimingcheng.Text.ToString().Trim()+"','"+fuliedu.Text.ToString().Trim()+"','"+fulineirong.Text.ToString().Trim()+"') ";
        int result;
        result = new Class1().hsgexucute(sql);
        if (result == 1)
        {
            Response.Write("<script>javascript:alert('添加成功');</script>");
        }
        else
        {
            Response.Write("<script>javascript:alert('系统错误，请检查数据库的连!');</script>");
        }
    }
	
}
总是显示系统错误，请检查数据库的连!

补充：public int hsgexucute(string sql)  
    {
        //myConnection.Open();
  SqlConnection conn = new SqlConnection();   
        conn.ConnectionString = connstring; 
        SqlCommand myCommand = new SqlCommand(sql, conn); 
       // SqlCommand cmd = new SqlCommand(sql, conn); 
    try
        {
            conn.Open();
            myCommand.ExecuteNonQuery(); 
            return 1;  
        }
        catch
        {
            //Console.WriteLine("SqlException:{0}",SQLexc);
            return 0;  
        }
        finally
        {
            conn.Close(); 
        }
    }

追问：CLASS1比较大 能不能加好友帮个忙 谢谢   我传给你 QQ28281919