KeypressEvent in C#

Question

Sir, I want your help in keypress event in the following form.

take a look to the form:-

You can see the House Number TextBox. I want the code that this control only accept the numbers as input by the user. It does not accept any key other than numbers.

Vulpes · Answer

Also don't forget to allow for the backspace key being pressed otherwise the users won't be too happy if they can't make corrections: private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsDigit(e.KeyChar) && e.KeyChar != 8) { e.Handled = true; } }

Pavan R Bhupalam · Answer

if (housenumber == "textbox.text") { if (housenumber { messagebox.show("enter valid number") ; } }

Iftikar Hussain · Answer

Hi, Use MaskedTest box and set Mask format as 000 (allow 3 digit) Regards, Iftikar

Sanjeeb Lenka · Answer

try this private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsDigit(e.KeyChar)) { e.Handled = true; } } or you can use this private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { string[] nums = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0" }; if (!nums.Contains(e.KeyChar.ToString())) e.Handled = true; }

Ish Bandhu · Answer

use regex like: Regex regex = new Regex(@"^\d$"); regex.IsMatch(your string)

KeypressEvent in C#

Answers (5)