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Код

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;

public class IsNumeric : Form
{
    [method: STAThread]
    public static int Main(string[] args)
    {
        Application.Run(new IsNumeric());
        return 0;
    }
    public TextBox txtbNum = new TextBox();
    public Button btnCheck = new Button();

    public IsNumeric()
    {
        InitializeComponent();
    }
    private void InitializeComponent()
    {
        txtbNum.Location = new Point(10,10);
        txtbNum.Size = new Size(150, 25);
        this.Controls.Add(txtbNum);

        btnCheck.Location = new Point(10, 45);
        btnCheck.Size = new Size(100, 25);
        btnCheck.Text = "Check it...";
        btnCheck.Click += new EventHandler(btnCheck_Click);
        this.Controls.Add(btnCheck);
    }
    private void btnCheck_Click(object sender, EventArgs e)
    {
        string strCheck = txtbNum.Text;
        Regex r = new Regex(@"\d");
        if (r.IsMatch(strCheck))
        {
            MessageBox.Show("Digital is over there...");
        }
    }
}