How to Allow only numbers for TextBox

[Giorgi Dalakishvili]

In the Keypress event handler check if the pressed key is digit or not. If not set handled to true. Don't forget backspace key.

Giorgi Dalakishvili #region signature my articles #endregion

[Harvey Saayman]

hey use a maskedTextBox instead of a notmal textBox

Harvey Saayman - South Africa Junior Developer .Net, C#, SQL

you.suck = (you.passion != Programming)

[sacr83]

Can i use regular expression or any validater?If yes how can i use that..? i tried Match MatchTelNum = Regex.Match(tel.Text, "[a-z&0-9]*"); Its wroks.But i had a problem coz if i entered "3333333" to that textBox1.It also giv an error message.If you can help me.. ReagrDzzz

CheeN

[wasimsharp]

Cheen on Press key Event of textbox use this code if (Char.IsLetter(e.KeyChar)) { e.Handled; }

wasim khan

[leppie]

sacr83 wrote:

Match MatchTelNum = Regex.Match(tel.Text, "[a-z&0-9]*"); Its wroks.

No, it does not work... That will match letters and digits and '&'.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

[leppie]

wasimsharp wrote:

if (Char.IsLetter(e.KeyChar)) { e.Handled; }

1. That wont compile. 2. Are you checking for digits or letters?

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

[Lost User]

int.TryParse in the key event handler is your friend.

[leppie]

Greeeg wrote:

int.TryParse in the key event handler is your friend.

Friends dont let friends overflow! What happens if the person enters 25 digits?

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

[Gareth H]

sacr83, If you only want to allow numbers, why not use a NumericUpDown control... MSDN[^]

Regards, Gareth. (FKA gareth111)

[wasimsharp]

No if (!Char.IsDigit(e.KeyChar)) { e.Handled = true; }

wasim khan

[Abhijit Jana]

Just use this private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { **if (!char.IsDigit(e.KeyChar)) { e.Handled = true; MessageBox.Show("Integer numbers only"); }** }

Best Regards ----------------- Abhijit Jana Check Out My Latest Article Java.NET : Integration of Java and .NET[^] "Success is Journey it's not a destination"

[Lost User]

Then I should take the time to read the question more precisely ;) A regex like \d{,7} for at most, or \d{7} for exactly 7 digits will do the job as well. But I'd use a NumericUpDown control for this task.

[Mbah Dhaim]

if you want to get an error as you type you can use KeyDown events then get your last entered character from your textbox, if last character is not what you suggest to input throw an errror