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

namespace PositiveTextBox
{
    public partial class PositiveTextBox : TextBox
    {
        public PositiveTextBox()
        {
            InitializeComponent();
        }

        private void PositiveTextBox_Validating(object sender, CancelEventArgs e)
        {
            try
            {
                int luku = Convert.ToInt16(Text);
                if (luku <= 0) e.Cancel = true;
            }
            catch (Exception)
            {
                e.Cancel = true;
            }
            if (e.Cancel == true) errorProviderPositiveTextBox.SetError(this, "Et syöttänyt positiivista kokonaislukua");
        }

        private void PositiveTextBox_Validated(object sender, EventArgs e)
        {
            errorProviderPositiveTextBox.SetError(this, "");
        }
    }
}