using System;

using System.Data;

using System.Xml;

public class Program

{

    public static void Main()

    {

        System.Data.DataTable dtCalc = new System.Data.DataTable();

​

        dtCalc.Columns.Add("_idx", typeof(Int32), "1");

        dtCalc.Columns.Add("shouldshow", typeof(string));

        dtCalc.Columns.Add("amount", typeof(Int32));

​

        DataRow workRow = dtCalc.NewRow();  

        workRow["shouldshow"] = "1";

        workRow["amount"] = 3000;

        dtCalc.Rows.Add(workRow);  

        Object objReturn = dtCalc.Compute("Count(_idx)","shouldshow = '1' and amount >= 3000");  

        Console.WriteLine(objReturn);

    }

}