Converts the value of a Unicode character to its lowercase 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, then use the method. The method is equivalent to ToLower(Char, CultureInfo.InvariantCulture).
Use String.ToLowerInvariant to convert a string to lowercase.
.NET FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
XNA FrameworkSupported in: 3.0, 2.0, 1.0
Portable Class LibrarySupported in: Portable Class Library
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8