public static DataFrame<R, C> Where<R, C>(
	this DataFrame<R, C> frame,
	Func<DataFrameRow<R, C>, bool> predicate
)

<ExtensionAttribute>
Public Shared Function Where(Of R, C) ( 
	frame As DataFrame(Of R, C),
	predicate As Func(Of DataFrameRow(Of R, C), Boolean)
) As DataFrame(Of R, C)

public:
[ExtensionAttribute]
generic<typename R, typename C>
static DataFrame<R, C>^ Where(
	DataFrame<R, C>^ frame, 
	Func<DataFrameRow<R, C>^, bool>^ predicate
)

[<ExtensionAttribute>]
static member Where : 
        frame : DataFrame<'R, 'C> * 
        predicate : Func<DataFrameRow<'R, 'C>, bool> -> DataFrame<'R, 'C>