public static string ToString<T>(
	this Nullable<T> source,
	string format,
	IFormatProvider provider,
	string defaultValue
)
where T : struct, new(), IFormattable

<ExtensionAttribute>
Public Shared Function ToString(Of T As {Structure, New, IFormattable}) ( 
	source As Nullable(Of T),
	format As String,
	provider As IFormatProvider,
	defaultValue As String
) As String

public:
[ExtensionAttribute]
generic<typename T>
where T : value class, gcnew(), IFormattable
static String^ ToString(
	Nullable<T> source, 
	String^ format, 
	IFormatProvider^ provider, 
	String^ defaultValue
)

[<ExtensionAttribute>]
static member ToString : 
        source : Nullable<'T> * 
        format : string * 
        provider : IFormatProvider * 
        defaultValue : string -> string  when 'T : struct, new() and IFormattable