Converts the value of a Unicode character to its uppercase equivalent using the casing rules of the invariant culture.
Assembly: mscorlib (in mscorlib.dll)
If your application is unaffected by the current culture and depends on the case of a character changing in a predictable way, use the method. The method is equivalent to ToUpper(Char, CultureInfo.InvariantCulture).
Use String.ToUpperInvariant to convert a string to uppercase.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.