You will need either a decimal or double.
A float can only hold 7 digits (not enough for this).
A double can hold 15-16 digits and a decimal can hold 28-29 significant digits.
See http://msdn2.microsoft.com/en-us/s1ax56ch(VS.80).aspx">http://msdn2.microsoft.com/en-us/s1ax56ch(VS.80).aspx for more info on value types.

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