how to round off a field to nearest thousand

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C#

ASP.NET

VS2010

Hi
I have 2 fields in a table namely cost price, selling price.
My project is working like this:-

Cost price * 2= selling price.

so if i enter 21928 as cost price, then after it gets multiplied by 2 it comes as 43856

i want this selling price to make 44000. I mean i want to make rounded off to nearest thousand so that last 3 digits comes zero always.

I have written the code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Configuration;
using System.Data;
using System.IO;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.ReportSource;
using CrystalDecisions.Reporting;
using CrystalDecisions.Web;

/// 
/// Summary description for JewelleryHelper
/// 
 public class JewelleryHelper
{
    /// 
    /// Get encoded selling price
    /// 
    /// Selling price
    /// Encoded selling price
    public static string GetEncodedSellingPrice(string price)
    {
        char[] arrPrice = Math.Round(double.Parse(price) * 2).ToString().ToCharArray();
       string finalSellingPrice = string.Empty;
        //Populating price in encoded format
        foreach (char letter in arrPrice)
        {
            finalSellingPrice += GetEncodedLetter(letter);
        }

Can anyone please tell me.

Please

Thanks
Sudeshna