Returns a double that represents the preferred width of this cell, with the associated units return in units.

public double GetPreferredWidth(out Units units)

Public Function GetPreferredWidth(ByRef units As Units) As Double

The units for the width.
MS Word equivalent: Table menu > Table Properties... > Table tab > Options... > Measure in

The preferred width of the table.
MS Word equivalent: Table menu > Table Properties... > Table tab > Options... > dropdown after "Preferred width"

Units units;
double width = table.GetPreferredWidth(out units);

Dim units As Units
Dim width As Double = table.GetPreferredWidth(units)