String.ToString Method (IFormatProvider)
.NET Framework 4.6 and 4.5
Returns this instance of String; no actual conversion is performed.
provider is reserved, and does not currently participate in this operation.
Because this method simply returns the current string unchanged, there is no need to call it directly.
Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Supported in: 3.0, 2.0, 1.0
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8