一、把DataTable插入数据库
public static void DataTableToDB()
{
      string _strExcelFileName = @"D:\example.xls";
      DataTable dtExcel = ExcelToDataTable(_strExcelFileName,"Sheet1");
      for (int i = 0; i < dtExcel.Rows.Count; i++)
      {
           InsertDataToAccess(dtExcel.Rows[i][0].ToString(), float.Parse(dtExcel.Rows[i][1].ToString()));
      }
}

二、把Excel数据读入DataTable
public static DataTable ExcelToDataTable(string strExcelFileName, string strSheetName)
{
      string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strExcelFileName + ";" +"Extended Properties=Excel 5.0;";
      string strExcel = string.Format("select * from [{0}$]", strSheetName);
      DataSet ds = new DataSet();

      using (OleDbConnection conn = new OleDbConnection(strConn))
      {
           conn.Open();
           OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, strConn);
           adapter.Fill(ds, strSheetName);
           conn.Close();
      }

      return ds.Tables[strSheetName];
}

三、向Access数据库表插入数据
public static void InsertDataToAccess(string _strPara,float _fPara)
{
      OleDbConnection oleDbConn = new OleDbConnection();
      oleDbConn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\ExcelData.mdb;User Id=admin;Password=;";
      oleDbConn.Open();

      string strInsertString = "INSERT INTO tb_excelData (strCollumn1,fCollumn2) VALUES (@strCollumn1,@fCollumn2)";
      OleDbCommand oComm = new OleDbCommand(strInsertString, oleDbConn);
      oComm.Parameters.Add("@strCollumn1", OleDbType.Char , 50);
      oComm.Parameters["@strCollumn1"].Value = _strPara;
      oComm.Parameters.Add("@fCollumn2", OleDbType.Double);
      oComm.Parameters["@fCollumn2"].Value = _fPara;
     
      ocomm.ExecuteNonQuery();
      oleDbConn.Close();
}