using System;
public class clsIsNumeric
{
 
    public void Main()
    {
 
        //****************************************************************************************
        // Example #1: IsNumeric(string)
 
        //****************************************************************************************
 
 
        //****************************************************************************************
        // Example #1: IsNumeric(string)
        // Not supported in C#, but here is code that duplicates what happens in VB
        // Returns a Boolean value that indicates if the string is Numeric. 
        //****************************************************************************************
 
        Console.WriteLine("Example #1: IsNumeric(strField)");
 
        string strField = "100.00";
 
        Console.WriteLine(SimulateIsNumeric.IsNumeric(strField)); //Returns True - decimals are numeric
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
 
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
 
}
//----------------------------------------------------------------------------------------
//	Copyright © 2003 - 2011 Tangible Software Solutions Inc.
//	This class can be used by anyone provided that the copyright notice remains intact.
//
//	This class simulates the behavior of the classic VB 'IsNumeric' function.
//----------------------------------------------------------------------------------------
public static class SimulateIsNumeric
{
    public static bool IsNumeric(object expression)
    {
        if (expression == null)
            return false;
 
        double testDouble;
        if (double.TryParse(expression.ToString(), out testDouble))
            return true;
 
        //VB's 'IsNumeric' returns true for any boolean value:
        bool testBool;
        if (bool.TryParse(expression.ToString(), out testBool))
            return true;
 
        return false;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
 
 
            clsIsNumeric myIsNumeric = new clsIsNumeric();
            myIsNumeric.Main();
 
        }
    }
}