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We need a class that has only one instance, and we need to provide a global point of access to the instance. We may also want to make sure that our solution is thread safe.
Many times we need to know executable path of Application and some time we need to know the path of assembly which is loaded. There are many options to get the location but not all are good as we think.
Regular expressions provide a powerful, flexible, and efficient method for processing text. The extensive pattern-matching notation of regular expressions enables you to quickly parse large amounts of text to find specific character patterns; to validate text to ensure that it matches a predefined pattern (such as an email address); to extract, edit, replace, or delete text substrings; and to add the extracted strings to a collection in order to generate a report. For many applications that deal with strings or that parse large blocks of text, regular expressions are an indispensable tool.
Here is a small snippet which will get the pressed char at keydown event. Sometimes we need to get Char at key down event rather than keypress event.
In this small snippet we will cover how to trap on Ctrl+C, Ctrl+V and Ctrl+X in TextBox KeyPress Event
If you handle the KeyDown event, the Modifiers property of the KeyEventArgs received by the event handler specifies which modifier keys are pressed. Alternatively, the KeyData property of KeyEventArgs specifies the character that was pressed as well as any modifier keys combined with a bitwise OR. However, if you are handling the KeyPress event or a mouse event, the event handler does not receive this information.