public partial class UserControl1 : UserControl
{
    public UserControl1()
    {
        InitializeComponent();
        db();
    }

    public void db()
    {
        DataTable dt = new DataTable();
        DataColumn[] td = new DataColumn[4];
        td[0] = new DataColumn("name", typeof(string));
        td[1] = new DataColumn("age", typeof(Int32));
        td[2] = new DataColumn("je", typeof(Int32));
        td[3] = new DataColumn("dz", typeof(string));
        dt.Columns.AddRange(td);

        DataRow tr = null;
        for (int i = 0; i < 3; i++)
        {
            tr = dt.NewRow();
            tr[0] = "name";
            tr[1] = 31;
            tr[2] = 20;
            tr[3] = "江西";
            dt.Rows.Add(tr);

            tr = dt.NewRow();
            tr[0] = "name";
            tr[1] = 30;
            tr[2] = 20;
            tr[3] = "江西";
            dt.Rows.Add(tr);

            tr = dt.NewRow();
            tr[0] = "name1";
            tr[1] = 20;
            tr[2] = 10;
            tr[3] = "浙江";
            dt.Rows.Add(tr);

            tr = dt.NewRow();
            tr[0] = "name1";
            tr[1] = 21;
            tr[2] = 10;
            tr[3] = "浙江";
            dt.Rows.Add(tr);

            tr = dt.NewRow();
            tr[0] = "name2";
            tr[1] = 10;
            tr[2] = 5;
            tr[3] = "湖北";
            dt.Rows.Add(tr);
        }
        dataGridView1.DataSource = dt;
    }

    public object DataSource
    {
        get { return dataGridView1.DataSource; }
        set { dataGridView1.DataSource = value; }
    }
}