enter only single digit number in text box

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In my window application i have many text box and i want to enter only single digit numeric value in it.Like i only enter 2 and 3 not enter two digit 23.How i do this can any one help.

C#

 if (System.Text.RegularExpressions.Regex.IsMatch("[^0-9]", txt_Digit8.Text))
{
   MessageBox.Show("Please enter only numbers.");
   txt_Digit8.Text.Remove(txt_Digit8.Text.Length - 1);
}

I use this code but it not work.

Also i want to give range like only accept 0 to 5 number.

Posted 20-Jan-12 4:00am

jaideepsinh

Updated 21-Jan-12 4:33am

v3

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6 solutions

Solution 1

You probably need one of these[^].

Posted 20-Jan-12 4:05am

Richard MacCutchan

Solution 4

why don't you use a dropdown with 10 digits ?

Posted 20-Jan-12 5:26am

nrgjack

Comments

fjdiewornncalwe 20-Jan-12 13:38pm

My 3. It would work, but is not really a very elegant solution. Users typically like the masked text box or numeric up/down approach better.

Solution 5

It's much simpler than that. Just set the MaxLength property of the textbox to 1 and then in the KeyUp event do the validation

Posted 20-Jan-12 5:26am

CodeHawkz

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OriginalGriff · Accepted Answer · 2012-01-20T04:06:00

Solution 2

Why not use a MaskedTextBox, with a Mask of "#", or a NumericUpDown, with a min on 0 and a max of 9?
Either way, the user can't enter a wrong value, so no need to validate.

Posted 20-Jan-12 4:06am

OriginalGriff

Comments

BobJanova 20-Jan-12 10:26am

Seconding the idea of a NumericUpDown.

fjdiewornncalwe 20-Jan-12 11:13am

You should add this as your own answer as an alternate. +5 for that if you do.

BobJanova 20-Jan-12 12:51pm

I haven't bothered posting a solution to this question since Griff got the right one before I got here :P

fjdiewornncalwe 20-Jan-12 11:12am

+5. This is the way to do it with a textbox.

BillWoodruff 20-Jan-12 19:54pm

'Thirding' the idea of using a NumericUpDown ... unless: this code is not converting the input to numbers, and then using them "as numbers."

Sergey Alexandrovich Kryukov 20-Jan-12 22:53pm

That's the best, especially NumericUpDown -- a choice of only 10 options, quite adequate without any chance to input anything invalid; my 5.
--SA

S V Saichandra · Accepted Answer · 2012-01-20T05:23:00

Solution 3

A very simple code:
use the following event and code:

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
       {
           textBox1.MaxLength = 1;
           if (Char.IsNumber(e.KeyChar))
           {
               e.Handled = false;
           }
           else
           {
               e.Handled = true;
           }
       }

Posted 20-Jan-12 5:23am

S V Saichandra

Comments

BillWoodruff 20-Jan-12 19:53pm

No need to set MaxLength in every invocation of the KeyPress EventHandler: set it once at design-time.

jaideepsinh 21-Jan-12 10:31am

perfect as i want.Thank's.

jaideepsinh 21-Jan-12 10:32am

Can i give range of number. Like accept only 0,1,2,3,4,5.

jaideepsinh · Accepted Answer · 2012-01-21T05:02:00

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
txt_current7.MaxLength = 1;
if (e.KeyChar == '0' || e.KeyChar == '1' || e.KeyChar == '2' || e.KeyChar == '3' || e.KeyChar == '4' || e.KeyChar == '5' || e.KeyChar == '\b')
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}