object reference problem

[James Dean]

i have a base class shape with 5 sub class shapes line,polygon,rectangle
etc. each of these have common attributes so what i have done is made a
class for these common attributes. i want to pass into my method the
type of shape i need for these common attributes but am having
trouble.These all have the same properties so i don't need to override
them i just want to be able to access the properties common to all of
them.......

public void retrievecommonattributes(ShapeType shape)
{
shape.fill
}

the only way i ccan access these attributes is through their classes
LineType,PolygonType etc.......

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