Numbers-Only Textbox

1

By vckicks on Jun 16th, 2008 12:01 pm

Use regular expressions, regex, to create an efficient textbox that only takes in digits as input.

//Add to the textbox's KeyPress event
private void txtBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (!System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(), "\\d+"))
e.Handled = true;
}

3 Years Ago

0

Thanks. Good one. It helped me.

farooqaaa

Posting Whiz in Training

295 posts since Jul 2008

Reputation Points: 61

Solved Threads: 71

3 Years Ago

0

this works for integer values, but not for negative and noninteger
numbers

nika0201

Newbie Poster

1 post since Oct 2008

Reputation Points: 10

Solved Threads: 0

2 Years Ago

0

doesnt work with back space

tmc01

Newbie Poster

5 posts since Aug 2009

Reputation Points: 10

Solved Threads: 0

2 Years Ago

0

for controls like backspace, del, etc... use this:

if (!char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar)) e.Handled = true;

:)

papanyquiL

Junior Poster

168 posts since May 2009

Reputation Points: 55

Solved Threads: 18

2 Years Ago

0

Your code does not work papanyquiL, at least on my system that is.
Check out this

ddanbe

Senior Poster

3,829 posts since Oct 2008

Reputation Points: 2,070

Solved Threads: 661

2 Years Ago

Show Comments

1

@ddanbe
Maybe you're not using the same event handler that I am.. Here's the complete code

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //makes sure that textBox1 is a number
            if (!char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar) && !char.IsPunctuation(e.KeyChar)) e.Handled = true;
        }

It works perfectly on my end.

papanyquiL

Junior Poster

168 posts since May 2009

Reputation Points: 55

Solved Threads: 18

2 Years Ago

Show Comments

1

Yes! This works fine!

ddanbe

Senior Poster

3,829 posts since Oct 2008

Reputation Points: 2,070

Solved Threads: 661

2 Years Ago

0

Use NumericUpDown control.

Ravenheart

Light Poster

27 posts since Nov 2009

Reputation Points: 11

Solved Threads: 5

2 Years Ago

0

how about numeric textbox for vb.net

ai_enma

Newbie Poster

1 post since Dec 2009

Reputation Points: 10

Solved Threads: 0

2 Years Ago

0

@ai_enma
?? This snippet almost reads as vb. Use Sub End Sub instead of curly braces, and an If End If.
If that not helps you, ask in the vb.net forum.

ddanbe

Senior Poster

3,829 posts since Oct 2008

Reputation Points: 2,070

Solved Threads: 661

1 Year Ago

0

Simplest method to use a numeric textbox which will accept the 'BackSpace' key also...

int isNum = 0;

if (e.KeyChar == '\b')
     e.Handled = false;
else if (!int.TryParse(e.KeyChar.ToString(), out isNum))
     e.Handled = true;

debasishsahu4u

Newbie Poster

1 post since Feb 2011

Reputation Points: 10

Solved Threads: 0

9 Months Ago

0

Please Help !!
if (!System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(), "\\d+"))

What does "\\d+" Means ??

islame-g

Newbie Poster

2 posts since Aug 2011

Reputation Points: 10

Solved Threads: 0

9 Months Ago

0

Hi,islame-g, welcome here.
Please don't ressurrect old threads, read the rules!
You better start a new thread instead.
To learn about regular expressions, you could start here: http://www.regular-expressions.info/dotnet.html

ddanbe

Senior Poster

3,829 posts since Oct 2008

Reputation Points: 2,070

Solved Threads: 661

9 Months Ago

0

Hi ddnabe,So sorry ,I didn't know about this rule .
Many Thx. for your reply ,I think this link is very useful

islame-g

Newbie Poster

2 posts since Aug 2011

Reputation Points: 10