In Part 1 of this series, I showed you an example of PowerShell's native validation capabilities. In that installment, I wrote a function that accepted a text string as input.

The following code example shows how you can use a guard clause in C# to prevent invalid input. Note how an exception is thrown if the input string is null or empty.

Of all the hats JavaScript can wear, its form-processing features are among the most sought and used. Learn how to use JavaScript for form processing, validation, and more.