public partial class Form3 : Form
    {
        DataGridLink dataLink;
        DataTable dt;
        DataGrid dg;
        public Form3()
        {
            InitializeComponent();            dataLink = new DataGridLink(printingSystem1);
            printingSystem1.Links.Add(dataLink);
            dt = new DataTable("hello");
            dt.Columns.AddRange(new DataColumn[]{
                new DataColumn("Age"),
                new DataColumn("Sex"),
                new DataColumn("name")
            });            DataRow dw = dt.NewRow();
            dw[0] = "20";
            dw[1] = "女";
            dw[2] = "MM";            dt.Rows.Add(dw);
            dg = new DataGrid();            dg.DataSource = dt;
            dataGridLink1.DataGrid = dg;            dataGridLink1.CreateDocument();        }    }为什么打印不出来,注意噢,我用的是Developer Express一套控件,使用过这套控件的请帮我解决。高分。。