c# 连接数据库出错

Question

如题 我用的是visual studio自带的express，运行提示是数据库操作出错，不知为什么呀，请高手指点，谢谢！using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace 病人管理系统
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
         //   int spara1 = textBox1.Text; //输入参数
       //     int? spara2 = 0; //输出参数  必须设为可空泛型并赋初值！！！
        //    this.QueriesTableAdapter            string sex = "男";
            if (radioButton2.Checked) sex = "女";            string name = "";
            name = textBox3.Text;            string patientNum = "";
            patientNum = textBox1.Text;            int age = 0;
            if (textBox2.Text!=null)
             age = Convert.ToInt16(textBox2.Text);             if (age < 0 || age > 200)
            {
                MessageBox.Show("年龄范围错误！", "输入失败！",
                    MessageBoxButtons.OK, MessageBoxIcon.Information);
                age = 0;
            }            string phenomenon = "";            string doctor = "";
               doctor= comboBox1.SelectedItem.ToString();
            string pclass = "轻微"; 
            pclass= comboBox2.SelectedItem.ToString();            //创建connection对象
                  string connString = @"Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Initial Catalog=病人;Integrate"+
            "d Security=True;User Instance=True";           SqlConnection connection = new SqlConnection(connString);            string sql = string.Format("INSERT INTO 病人(病人编号,姓名,年龄,性别,医生,类别,病症) VALUES('{0}','{1}','{2}','{3}','{4}','{5}','{6}')",
               patientNum, name, age, sex, doctor, pclass, phenomenon);            try
            {
                
                connection.Open();
                //创建Command对象
                SqlCommand command = new SqlCommand(sql, connection);
                //执行添加命令，返回值为更新的行数
                int count = command.ExecuteNonQuery();
                if (count > 0)
                {
                    MessageBox.Show("添加病人信息成功", "添加成功"
                        , MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show("添加病人信息失败", "添加失败"
                                           , MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "操作数据库出错！", MessageBoxButtons.OK,
                    MessageBoxIcon.Exclamation);
            }
            finally
            {
                connection.Close();//关闭数据库连接
            }
        }        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
           
        }        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

Answer 1

string connString ="Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Initial Catalog=病人;Integrate"+
  "d Security=True;User Instance=True";orstring connString =@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Initial Catalog=病人;Integrate"+
  "d Security=True;User Instance=True";

Answer 2

connectionString="Data Source=.;Initial Catalog=病人;User ID=sa;pwd=""
如果数据库有密码输入密码