private void Form1_Load(object sender, EventArgs e)
        {
            //推模式
            string sql = "Select T1, T2, T3 FROM T where T1=''a''";
            string DBConfig_sql = @"Data Source=SYWZSWL\SQLEXPRESS;Initial Catalog=Test;User ID=sa;Password=123456";
            DataSet ds = new DataSet();
            SqlConnection sqlCon = new SqlConnection(DBConfig_sql);
            SqlCommand sqlCmd = new SqlCommand(sql, sqlCon);
            SqlDataAdapter sqlAd = new SqlDataAdapter();
            sqlAd.SelectCommand = sqlCmd;
            sqlAd.Fill(ds, "sql");
            crystalReport1.Load(Application.StartupPath + "CrystalReport.rpt");
            crystalReport1.SetDataSource(ds.Tables["sql"]);
//{?}中的参数可以不用赋值，即使赋了值也不起作用。
            // CrystalReportSource1.ReportDocument.ParameterFields["Parm"].CurrentValues.AddValue("1234567");
            crystalReport1.ParameterFields["Title"].CurrentValues.AddValue("这时推模式的报表样例！");
            crystalReportViewer1.ReportSource = crystalReport1;
}