Preparing to MS Exam 70-483 - Validate application input

The full set of questions I'm trying to cover in time of my preparation to MS Exam 70-483  you can find here.

Triggering validation

The main triggers for validation activation can serve:

• Keystroke validation
• Field(or other input element) Validation
• Form Validation

To validate data we can use built-in functions as

• Parse, TryParse methods
• String methods
• Contains
• EndsWith / StartsWith
• IndexOf
• IndexOfAny
• IsNullOrEmpty
• UsNullOrWhitespace
• LastIndexOf
• LastIndexOfAny
• Remove
• Replace
• Split
• Substring
• ToLowet
• ToUpper
• Trim
• TrimStart
• TrimEnd
• DateTime methods
• Regular Expressions
• IsMatch
• Match
• Matches
• Replace
• Split

NOTE

You should not forgot about sanitty checks and with this can help Debug.Assert method or If-clause throwing and exception when some values are inapropriate from the point of view of logic.

Regular Expressions 

Examples