What should be correct data structure to store tabular format data.

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C#3.5

Hi All,
I have data like below:
List<obj> = {
obj1 prop1,
obj2 prop1,
obj3 prop1,

obj1 prop2,
obj2 prop2,

obj2 prop3,
obj3 prop3,

obj1 prop4,
obj2 prop4,}

But in UI I have to display above like this :

prop1 obj1 obj2 obj3
prop2 obj1 obj2 -
prop3 - obj2 obj3
prop4 obj1 - obj3

In short number of rows will be dependent on number of properties and number of columns on number of properties.
I tried to use Dictionary. But it does not fulfill my all scenarios.

Thanks in advance.