How to validate the textbox ,so that it should accept only the positive numbers

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I want to display a textbox ,which should accept only positive integer,it should not accept any other special charecters.
please do the needful.

Posted 23-May-13 19:14pm

jyothivs

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Rockstar_ 24-May-13 1:18am

Windows or web?

Prasad Khandekar 24-May-13 1:33am

Hello Jyothivs,

For Windows Forms you can refer to this tutorial (http://blog.scosby.com/post/2010/02/11/Validation-in-Windows-Forms.aspx). For ASP.Net you can refer to this MSDN documentation (http://msdn.microsoft.com/en-us/library/debza5t0(v=vs.100).aspx) or this CP article (http://www.codeproject.com/Articles/426761/Exploring-ASP-NET-Validation-Controls)

Regards,

4 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-05-23T19:34:00

Don't validate it, filter out every characters but digits. More exactly, validate late, but first filter our unwanted characters as the user types the value in. You did not tag the UI library or application type you are using, but in all cases this is possible. Typically, this is handling of the event KeyPress.

On top of it, validate the value. First of all, if you type no digits or too many, it won't be parsed as any integer type, so first try System.UInt64.TryParse(yourTextBoxText) (or other appropriate unsigned integer type). When parsing is successful, you can additionally validate for required range of the value.

—SA

Arun Vasu · Answer 2 · 2013-05-23T19:39:00

Solution 2

you can do it by regular expression it may be windows or web.

i will give you the link. just go through

https://gkskonline.wordpress.com/2013/05/20/email-validation-using-regex/[^]

Posted 23-May-13 19:39pm

Arun Vasu

Alexander Duzhev · Answer 3 · 2013-05-28T05:23:00

Solution 3

if you work with WinForms it's possible to use MaskedTextBox control with Mask property set into 000000 for numbers from 0 to 999999

Posted 28-May-13 5:23am

Alexander Duzhev

Updated 28-May-13 5:26am

v2

Basmeh Awad · Answer 4 · 2013-05-28T06:12:00

Solution 4

try this

C#

private void textBox1_KeyPress_1(object sender, KeyPressEventArgs e)
       {
           if (!(Char.IsLetter(e.KeyChar) || Char.IsControl(e.KeyChar)))
           {
               e.Handled = true;
        }
       }

Posted 28-May-13 6:12am

Basmeh Awad