How do you make a text-box only accept numbers and decimals?

Question

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C#

I'm wondering how to make a text-box only accept 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 0s, and.s.

Posted 14-Oct-12 5:28am

Curtdawg123

Updated 14-Oct-12 5:32am

Kenneth Haugland

v2

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Kenneth Haugland 14-Oct-12 11:32am

Check the preview of the text change, if its not in your group than stop it, and if it is then don't stop it. And the questrion must have been asked 10 times here on this site before...

[no name] 14-Oct-12 11:33am

...this week

Kenneth Haugland 14-Oct-12 11:35am

Its really easy to do also... Once you get the point that you could stop a key down on the textbox

[no name] 14-Oct-12 11:34am

I am wondering what have you tried?

Kenneth Haugland 14-Oct-12 11:36am

I must confess I haven't tried this one, I'm not sure if its WinForms or WPF so...

6 solutions

Solution 2

what have you tried?[^]

Posted 14-Oct-12 6:00am

Nelek

Solution 3

http://www.csharpfriends.com/Forums/ShowPost.aspx?PostID=79881[^]
http://www.pcreview.co.uk/forums/textbox-only-numbers-and-decimal-seperator-t3667663.html[^]
NumericTextBox (C#.NET)[^]

Posted 14-Oct-12 6:41am

ridoy

Solution 5

You can use NumericUpdown for this.

You can hide up and down arrow with this code
NumericUpdown1.Controls[0].Hide();

for disable increment and decrement :
set Increment property to zero

for use decimal values:
set DecimalPlaces 1 or more

and you can not use e value

don't forget to set Maximum and Minimum values

it seems textbox but only accept numeric values

Posted 14-Oct-12 22:39pm

Member 2572805

Updated 14-Oct-12 22:42pm

v3

Solution 6

use regular expression /\b^[0-9]*\.?[0-9]*?$\b/ that only allow 0-9 and dot like 11.22

Posted 14-Oct-12 23:19pm

bhargavpp

Solution 1

Have a search on Google, that will help you!

Posted 14-Oct-12 5:43am

Thomas Daniels

Comments

Curtdawg123 14-Oct-12 12:09pm

Thanks, I figured it out

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ahmad zrein · Accepted Answer · 2012-10-14T15:47:00

C#

private void tbacc_Receipt_nAmount_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsDigit(e.KeyChar) && e.KeyChar != '.')
    {
        e.Handled = true;
    }

    if (!char.IsControl(e.KeyChar))
    {

        TextBox textbox = (TextBox)sender;

        if (textbox.Text.IndexOf('.') > -1 &&
                 textbox.Text.Substring(textbox.Text.IndexOf('.')).Length >= 3)
        {
            e.Handled = true;
        }
    }
}