How to make textbox with mobile number format

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hello , I want to make the textbox's formats as phone number , while I type for example 55555555 it will will appear as 55 555 555

What I have tried:

I tried in the text_changed event to make the format as string.format ( "{0:#, ## ### ###}", convert.toint (textbox.text) )
but it didn't work , the cursor keeps changing its place while I type

Posted 6-Jul-20 10:10am

Member 14190053

Updated 6-Jul-20 22:57pm

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[no name] 6-Jul-20 17:11pm

Show your code; you're possibly not "handling" the event properly.

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OriginalGriff · Answer 1 · 2020-07-06T11:09:00

You can move the cursor back where it "belongs" by reading the SelectionStart property to find out where the user had it, and writing it to set it's new position, but it's messy, and you'll need to think carefully about where it should be each time. You will also have to handle "undoing" the format before you convert it to a number (which mobile phone numbers aren't: they generally start with a leading zero which will be removed by a conversion and may start with a "+" character and a country code)

You can find FormattedTextBox controls (of varying utility and quality) with Google, but personally I wouldn't bother: if you want to display a formatted mobile number, then I would format it once when the user leaves the control, and "unformat" it when he enters again.
That's a lot easier than "on the fly" formatting, both for you and the user typing.

Maciej Los · Answer 2 · 2020-07-06T22:57:00

Solution 2

Check this out: MaskedTextBox.Mask Property (System.Windows.Forms) | Microsoft Docs[^]

Posted 6-Jul-20 22:57pm

Maciej Los