Assigning a default value of something other than a null string in an input box is recommended to allow the program to differentiate between the user clicking Cancel and the user failing to enter data.

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Assigning a default value in an input box is recommended to differentiate between the user clicking Cancel and the user failing to enter data. If the default value is null, then clicking cancel and failing to enter data will have the same effect.

Assigning a Default Value of Something Other Than a Null