我是一名新手，刚学习c#,在书在看到了一个例子，但运行不了，不知为何，请高手指教。下面是程序代码：
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsApplication10
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("请输入要连接的数据库名称");

            }
            else
            {
                try
                {
                    string ConStr = "server=;database=" + textBox1.Text.Trim() + ";uid=;pwd=;";

                    SqlConnection conn = new SqlConnection(ConStr);
                    conn.Open();
                    if (conn.State == ConnectionState.Open)
                        label2.Text = "数据库[" + textBox1.Text.Trim() + "]已经连接并打开";
                }
                catch
                {
                    MessageBox.Show("连接数据库失败");
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}

谢谢你的指点，这段代码只是测试是否连接到数据库。我的sql server 2005服务器类型设为数据库引擎，服务器名称设为本机，身份验证设为Windows身份验证。在uid=后面输入了Administrator，但还是运行不正确，不知为何？