class clsDyCrystalReportCore
    {
        /// <summary>
        /// 将传入的datatable转换成报表模板所需要的datatable
        /// 数据全部转换为string
        /// </summary>
        /// <param name="dt">来源表</param>
        /// <returns>报表模板所需要的datatable</returns>

        public DataTable dtx(DataTable dt)
        {
            DataSet1.BigTatableDataTable dtx1 = new DataSet1.BigTatableDataTable();         
            object[] obj = new object[dt.Columns.Count];
           //特别注意：所选择的表的列的数目需<=Bigtable的字段数目
            //请自行填写保护代码
            for (int i = 0; i <dt.Rows.Count ; i++)
            {
                dtx1.Rows.Add(dtx1.NewRow());

                for (int j = 0; j < dt.Columns.Count ; j++)
                {
                    dtx1.Rows[i][j] = dt.Rows[i][j].ToString();   
                }             
            }
            return dtx1;
        }
    }
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using CrystalDecisions.Shared;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Windows.Forms;
using System.Data.OleDb;
namespace DyCrystalReportDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            String tblName = comboBox1.Text ;
             String connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + System.Threading.Thread.GetDomain().BaseDirectory+ "bbtcrall.mdb" + ";";
            
            if (tblName == "")
            {
                MessageBox.Show("请选择表名");
                comboBox1.Focus();
                return;
            }

            //打开数据库连接
            
            DataTable dt1 = new DataTable();
            DataTable dtx = new DataTable();
            OleDbDataAdapter da = new OleDbDataAdapter();
            OleDbConnection cn = new OleDbConnection(connstr);
            
            //打开选择的表(注意进行错误保护)

            //如果要实现任意列，只要更改此处的SQL为具体的字段即可
            da = new OleDbDataAdapter("SELECT * From " + tblName, cn);
            da.Fill(dt1);

            //处理ds1
            clsDyCrystalReportCore xCore = new clsDyCrystalReportCore();
            dtx = xCore.dtx(dt1);
            
            ReportDocument myReport = new ReportDocument();
            string reportPath = System.Threading.Thread.GetDomain().BaseDirectory + "crystalreport1.rpt";
            myReport.Load(reportPath);

            //绑定数据集，注意，一个报表用一个数据集。

            myReport.SetDataSource(dtx);
           
            crystalReportViewer1.ReportSource = myReport;
            crystalReportViewer1.RefreshReport();
        }

        private void Form1_Load(object sender, EventArgs e)
        {          
            comboBox1.Items.Add ("Test1_1");
            comboBox1.Items.Add ("Test1_2");        
        }
    }
}