前期准备1

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

        void initLV(ListView l) 
        {
            l.MultiSelect = false;
            l.GridLines = true;
            l.FullRowSelect = true;
            l.View = View.Details;
        }

        void loadLV(ListView l,string sql) 
        {
            try
            {
                con.Open();
                SqlDataAdapter da=new SqlDataAdapter(sql,con);
                DataTable dt=new DataTable();
                da.Fill(dt);
                l.Items.Clear();
                l.Columns.Clear();
                int i,j;
                for (i = 0; i < dt.Columns.Count; i++)
                    l.Columns.Add(dt.Columns[i].Caption,(l.Width-4)/dt.Columns.Count);
                for (i = 0; i < dt.Rows.Count; i++) 
                {
                    ListViewItem li = new ListViewItem();
                    li.SubItems[0].Text=dt.Rows[i][0].ToString().Trim();
                    for(j=1;j<dt.Columns.Count;j++)
                        li.SubItems.Add(dt.Rows[i][j].ToString().Trim());
                    l.Items.Add(li);
                }
            }
            catch { }
            finally { con.Close(); }
        }

        SqlConnection con = new SqlConnection();

        void loadCB(ComboBox c,string sql) 
        {
            try 
            {
                con.Open();
                SqlCommand cmd = con.CreateCommand();
                cmd.CommandText = sql;
                SqlDataReader rd = cmd.ExecuteReader();
                c.Items.Clear();
                while (rd.Read()) 
                {
                    string s = rd.GetValue(0).ToString().Trim() ;
                    if (s != "") c.Items.Add(s);
                }
            }
            catch { }
            finally { con.Close();}
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try 
            {
                con.ConnectionString =@"server=8L6CIZNUU7R8XA7\SQLEXPRESS;database=2012;integrated security=true";
            }
            catch { }
            initLV(listView1);
            initLV(listView2);
            loadLV(listView1,"select wnum as 员工号,wname as 员工名,wplace as 所在地 from workers");
            loadCB(comboBox1,"select wname from workers group by wname");
            loadCB(comboBox2,"select cname from company group by cname");
            //细节
            this.FormBorderStyle = FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Text = "员工工作管理系统";
            textBox1.MaxLength = 3;
            textBox2.MaxLength = 10;
            textBox3.MaxLength = 10;
        }