Get kerning offset value for given character pair and font in .NET

How can I get kerning adjustment of space between 2 given chars in .NET? In WPF application?

For exampl开发者_JAVA技巧e, lets say I have font Times New Roman of size 22 that is bold. What kerning will be used for characters A and v ? How can I get this value in my WPF application ?

If you wander why do I need it: I want to make H.B.'s answer to my question Create guitar chords editor in WPF to work with kerning.