C# 通讯录源码,实现了增删改功能(含数据库下载)

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
//download by http://www.codefans.net
namespace PersonInfoInsert
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnInsert_Click(object sender, EventArgs e)
        {
            int age;
            try
            {
                age = int.Parse(this.txtage.Text);
            }
            catch (Exception)
            {
                MessageBox.Show("年纪必须是数字", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            string sql = string.Format("insert into userinfo values('{0}',{1},'{2}','{3}','{4}')",this.txtname.Text,age,this.cboQuo.Text,this.txtphone.Text,this.txtaddress.Text);
            try
            {
                DBhelper.con.Open();
                SqlCommand cmd = new SqlCommand(sql, DBhelper.con);
                int k = cmd.ExecuteNonQuery();
                if (k == 1)
                {
                    MessageBox.Show("添加成功");
                }
                else
                {
                    MessageBox.Show("添加失败");
                }

            }
            catch (Exception)
            {

                throw;
            }
            finally
            {
                DBhelper.con.Close();
            }
        }
        // 下载于www.51aspx.com
        private void btnupdate_Click(object sender, EventArgs e)
        {
            int age;
            try
            {
                age = int.Parse(this.txtage.Text);
            }
            catch (Exception)
            {
                MessageBox.Show("年纪必须是数字", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            string sql = string.Format("Update  UserInfo set age={0},qualification='{1}',phone='{2}',address='{3}' where UserName='{4}'",age,this.cboQuo.Text,this.txtphone.Text,this.txtaddress.Text,this.txtname.Text);
            try
            {
                DBhelper.con.Open();
                SqlCommand cmd = new SqlCommand(sql, DBhelper.con);
                int k = cmd.ExecuteNonQuery();
                if (k == 1)
                {
                    MessageBox.Show("修改成功");
                }
                else
                {
                    MessageBox.Show("修改失败");
                }

            }
            catch (Exception)
            {

                throw;
            }
            finally
            {
                DBhelper.con.Close();
            }
        }

        private void btndel_Click(object sender, EventArgs e)
        {
            string sql = string.Format("delete userinfo where UserName='{0}'",this.txtname.Text);
            try
            {
                DBhelper.con.Open();
                SqlCommand cmd = new SqlCommand(sql, DBhelper.con);
                int k = cmd.ExecuteNonQuery();
                if (k == 1)
                {
                    MessageBox.Show("成功");
                }
                else
                {
                    MessageBox.Show("删除失败");
                }

            }
            catch (Exception)
            {

                throw;
            }
            finally
            {
                DBhelper.con.Close();
            }
        }
    }
}