KeypressEvent in C#

Bineesh Viswanath

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.

5 Replies

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Vulpes13y ago
Accepted 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 Ramamurthy13y ago
if (housenumber == "textbox.text")
                {
                    if (housenumber< 1)
                    {
                       messagebox.show("enter valid number") ;
}
}
Iftikar Hussain13y ago
Hi,
Use MaskedTest box and set Mask format as 000 (allow 3 digit)

Regards,
Iftikar
Ish Bandhu13y ago
use regex like: Regex regex = new Regex(@"^\d$"); regex.IsMatch(your string)
Sanjeeb Lenka13y ago
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;

}