C# Tutorial 57: TextBox which accepts only numbers in C#

[@randomhappyguy6719]

.Net has upgraded and int representation of characters are no longer needed. We can use code like this:
char ch = e.KeyChar;
if (!char.IsDigit(ch) &&
ch != Convert.ToChar(Keys.Back) &&
ch != Convert.ToChar(Keys.Delete))
e.Handled = true;
Here we use a Convert.ToChar(Object object) to directly convert a Keys enumeration variable to a character, then compare.

[@kinglore27]

Thank you!

[@kojydamn7818]

Thank you so much, this works perfectly!

[@ZCProductions211]

If Anyone is wondering how to make it possible to enter a period like 1.70 then add
&& ch != 46 to the if statement after the ch != 8. I had to do this for the program i am making.

[@filipMmM]

thank you :)

[@krolik3524]

Thank you.

[@shovikanand3214]

very knowledgeful video....but i want to add more concept in this, here e is object of keypressEventArgs Class. & this class has 2 properties namely keychar & handled. keychar gives u key pressed by user. & handled doesnt allows wrong entry into textboxes. here char is structures. & Isdigit, Isletter, IsDigitorLetter,Issymbol .....are its properties..
hence we use , char.Isdigit(e.keychar) & similary e.handled= true; restrict wrong entry & e.handled= false; to allow entry in textbox. hope u get benifited after reading this...

[@yameen_yasin]

thankew sir aap explane bhi ache krte ho or kaam to hota he aap k acha hai

[@muraligsn]

Thanks for the video..but please stop wiggling the mouse.

[@kaimemes]

what you gotta do wit ha big fat mouse
*WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE WIGGLE*

[@avi12]

I was looking for this so much time. *Subscribed*

[@amazingbandproyects3253]

Works : ) ..Thank you so much.....Regards from Costa Rica : )

[@girishbawaskar3775]

and if i want only char than ?????

[@LivinExtreme]

what if I paste it doesn't work then

[@23anonymous46]

It's really help me so much, thank you very much guy C#

[@MegaMaliak]

Hi how do i make validation to allow format like prices ONLY? 999.99 is the precise amount i need. Nothing more than that, but can't go below 0.

[@HearthsTavern]

Great Video! Thanks for the upload
How can I make this accept decimal?

[@Kaizer-qe7kk]

One question. How do I get data from the textbox as an integer?
I need to perform a calculation with the data obtained.

[@3dwinarcip394]

Niceee❤❤❤ Thanks

[@انامسلموكفى]

Thnak u for your video its great i just have a small isssue with this filtraion how can we for example just allow numbers between 0 and 13 ?

[@محمدالنائلي-ر7ي]

استخدم شرط if لتحديد أصغر و أكبر قيمة

[@mikaillim9978]

hii.. why you can using DateTimePicker ? it simple :D

[@AhsanAli-uu9ui]

i cant found your Remaining lectures of this course in this Channel. what i do? please give me link of complt tutorial of this course. Thanks

[@arvicishechema]

You helped me so much. Thank you bhai

[@rodrigo-vl7bi]

thanks for showing this solution, but im sure there must be a simplier way, al keep looking for it

[@malthesrensen4953]

Seems wierd that this isen't in the library already. When pasting, you can still add text to the field for example, so that has to be fixed aswell. Seems like a lot of work for something that should've been in the library already

[@MrFerny82]

Hi, your tutorial is great but i'm running into an issue and I want to use number an at the end the character -, how to i do that? my example should look like this only 102030-10
Thanks

[@oblivionX000]

Is that possible with decimals as well? Cause I would try to input a period for the decimal which then the code prevents me from doing so.

[@idsoftware7]

how about decimals ?

[@IAmESG]

Or this:
if (System.Text.RegularExpressions.Regex.IsMatch(tb11.Text, "[^0-9-]")) // only accepts 0-9 and negative
{
MessageBox.Show("Please enter numbers only!");
tb11.Clear();
}

[@thifhelimbilu2477]

Thanks For that code it helps me :)

[@funtaro]

Thanks, it's help me alot

[@adrianm.4873]

Thank you!

[@kmuralikrishna1582]

if we want combination of numbers and string ?

[@intelligentcoding689]

Amazing. thanks

[@Verses01]

Awesome Thank you!!!

[@hafizullahmutahidi264]

Thank You So So Much

[@Soundtech98]

Still doesn't prevent the user from pasting directly into the text box...

[@wunnathaw]

that is cool..but I input 012 or 1.11 .It cannot validate .

[@jobijose8354]

this is not an validation process infact we can block some sort of data thats all

[@brv0102]

thanks, bro!

[@deano2187]

Thank you senpai

[@atquoc9071]

Thanks for video

[@ariii39]

Thanks!!!!

[@bayaromer5850]

thank you soooooooo much

[@muhdzikrie8682]

thanks

[@thiagosarraf7265]

where are you from? I'm brazilian

[@TheTrueKailash]

thank you

[@YukthiJayakody]

Thanks a lot....

[@sheetalvishwakarma2697]

Voice is not auditable

[@prodbyfys]

Thanks Bro

[@bluehornet6752]

Here's a routine that's worked well for me...
private void CharValidation_KeyDown(object sender, KeyEventArgs e)
{
// Rejects any keys not in the range of 0-9 (by ASCII number),
// the Delete key or the Back key
if ((e.KeyValue < 48 || e.KeyValue > 57) && e.KeyCode != Keys.Delete
&& e.KeyCode != Keys.Back
{
e.SuppressKeyPress = true;
SystemSounds.Beep.Play();
}
}

[@Volln0v]

This works, but not if a user used the num pad. This is what I used for my program, it's kind of lengthy but it allowed for numpad decimal, period, numlock, and arrow keys. Probably not the most efficient way, but it works.
if ((e.KeyValue < 48 || e.KeyValue > 57) && e.KeyCode != Keys.OemPeriod && e.KeyCode != Keys.NumLock && e.KeyCode != Keys.Decimal && e.KeyCode != Keys.Delete
&& e.KeyCode != Keys.Back && e.KeyCode != Keys.NumPad0 && e.KeyCode != Keys.NumPad1 && e.KeyCode != Keys.NumPad2 && e.KeyCode != Keys.NumPad3 && e.KeyCode != Keys.NumPad4 && e.KeyCode != Keys.NumPad5 && e.KeyCode != Keys.NumPad6 && e.KeyCode != Keys.NumPad7 && e.KeyCode != Keys.NumPad8 && e.KeyCode != Keys.NumPad9 && e.KeyCode != Keys.Left && e.KeyCode != Keys.Right)
{
e.SuppressKeyPress = true;
SystemSounds.Beep.Play();
}

[@dennisJNT]

nice man..

[@gnscode7988]

helpfull

[@kristiancagaoan2223]

THANKS BRUH

[@iiN1GH7M4R3ii]

thank youuuuu

[@angelodeus8423]

next

[@claytonvolner5950]

Great video. Thanks for the help

[@MonderMurshed]

THANK U BRO!

[@vihangasilva]

Thank you