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Validating Phone Numbers in C# in Various Formats

Test Cases

Testing the program with non-numeric characters:

Testing the program with alpha characters:

Testing the program with negative numbers:

Observations

I observed that the C# code that I wrote can validate US phone numbers in different formats. There are no inputs that cause a runtime error because all the data are treated as a string (numbers are treated as string) and no data type conversion necessary that can cause a runtime error. There is no logic error as well but the program is only limited to validating the following phone number formats:

1-515-867-5309
- The program makes sure that if dialing internationally then the first digit should be 1.
515-867-5309
(515)867-5309

If other formats are valid that I do not know of, then the program will be logically wrong because it wasn't included in the validation.