数据库连接,帮我看看有什么错

[lim62008]

using System;
using System.Collections;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Diagnostics;
using System.ComponentModel;
using System.Collections;


namespace WebSite1.DataAcessLayer
{
    public class Database : IDisposable
    {
        protected SqlConnection Connection;

        protected String ConnectionString;

        public Database()
        {
           ConnectionString = ConfigurationSettings.AppSettings["DBConnectionString"];
        }

        ~Database()
        {
            try
            {
                if (Connection != null)
                {
                    Connection.Close();
                }
            }catch { }
            try
            {
               Dispose();

            }
            catch{ }
        }
        protected void open() 
        { 
            if(Connection == null)
            {
                Connection = new SqlConnection(ConnectionString);
            }
            if(Connection.State.Equals(ConnectionState.Closed))
            {
                Connection.Open();
            }
        }
        public void Close() 
        {
            if (Connection != null)
            {
                Connection.Close();
            }
        }
        public void Dispose()  //释放连接数据库所占用的资源
        { 
            if(Connection !=null)
            {
                Connection.Dispose();
                Connection = null;
            }
        }
        public int ExecuteSQL(String SqlString)
        {
            int count = -1;
            open();
            try
            {
                SqlCommand cmd = new SqlCommand(SqlString, Connection);
                count = cmd.ExecuteNonQuery();

            }
            catch
            {
                count = -1;

            }
            finally
            {
                Close();
            }
            return count;
        }
        public DataSet GetDataSet(String SqlString) 
        {
            open();
            SqlDataAdapter adapter = new SqlDataAdapter(SqlString, Connection);
            DataSet dataset = new DataSet();
            adapter.Fill(dataset);
            Close();
            return dataset;
            
        }
        public DataRow GetDAtaRow(String SqlString) 
        {
            DataSet dataset = GetDataSet(SqlString);
            dataset.CaseSensitive = false;
            if(dataset.Tables[0].Rows.Count>0)
            {
                return dataset.Tables[0].Rows[0];
            }
            else
            {
                return null;
            }
        }

    }
}

[yagebu1983]

单步调试一下程序！！

[idotry]

设置断点，逐步调试！