C# Language
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C# Language String Manipulation Changing the case of characters within a String
Example
The System.String class supports a number of methods to convert between uppercase and lowercase characters in a string.
System.String.ToLowerInvariantis used to return a String object converted to lowercase.
System.String.ToUpperInvariantis used to return a String object converted to uppercase.
Note: The reason to use the invariant versions of these methods is to prevent producing unexpected culture-specific letters. This is explained here in detail.
Example:
string s = "My String";
s = s.ToLowerInvariant(); // "my string"
s = s.ToUpperInvariant(); // "MY STRING"
Note that you can choose to specify a specific Culture when converting to lowercase and uppercase by using the String.ToLower(CultureInfo) and String.ToUpper(CultureInfo) methods accordingly.
