The maximum size of a string variable is 2 GB or about 1 billion characters because each char variable uses 2 bytes due to the internal use of Unicode (UTF-16) encoding for characters.

The string type leaves text data in memory for too long and it's too visible. The SecureString type encrypts the text and ensures that the memory is released immediately. WPF's PasswordBox control stores the password as a SecureString variable, and when starting a new process, the Password parameter must be a SecureString variable. For more discussion, visit:

http://stackoverflow.com/questions/141203/when-would-i-need-a-securestring-in-net

When concatenating more than about three string variables, you will use less memory and get improved performance using StringBuilder than using string.Concat method or the + operator.

Each item in a linked list has a reference to its previous and next siblings as well as the list itself so should be used when items need to be inserted and removed from positions in the list without actually moving the items in memory.

The SortedList class uses less memory than SortedDictionary, SortedDictionary has faster insertion and removal operations for unsorted data. If the list is populated all at once from sorted data, SortedList is faster than SortedDictionary. For more discussion, visit:

http://stackoverflow.com/questions/935621/whats-the-difference-between-sortedlist-and-sorteddictionary

 For a complete list of culture codes, visit: http://timtrott.co.uk/culture-codes/

Localization affects the user interface of your application. Localization is controlled by a neutral (language only) or specific (language and region) culture. You provide multiple language versions of text and other values. For example, the label of a text box might be First name in English, and Prénom in French.

Globalization affects the data of your application. Globalization is controlled by a specific (language and region) culture, for example, en-GB for British English, or fr-CA for Canadian French. The culture must be specific because a decimal value formatted as currency must know to use Canadian dollars instead of French Euros.

Internationalization is the combination of localization and globalization.

 $ represents the end of the input.

 \d+

[0-9]+

The effort is not worth the pain for you or your users. Validating an e-mail address using official specification doesn't check whether that address actually exists or whether the person entering the address is its owner. For more discussion, visit:

http://davidcel.is/posts/stop-validating-email-addresses-with-regex/

http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address