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yadavdepFlag for India

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Custom Masking for C# textbox to allow phone numbers

Our web application has a masking for phone numbers "(###) ###-####".

Now our app can sync the data with other apps as well like QuickBooks Online.
In them users can enter the phone number like (123) 122-2323 #1, (123) 122-2323 ex1, (123) 122-2323 ext 1.

We are trying to make a custom masking so that we can respect the above-entered phone numbers and show them properly.

But till now we did not any success, Help needed here. 
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