how to made validation in checkbox?

Question

hello dear
i am in problems to create validation that if i dont write number i write charecter then its show error that " only number are allowed" and user can't move textbox in next textbox.

if any body help me best regurds..

Satyapriya Nayak · Answer

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace Number_Character_validate_Csharp { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void textBox1_KeyPress(object sender KeyPressEventArgs e) { // Number Validation(only Number allowed) if (!System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString() \d+)) { e.Handled = true; } } } }