Is there an exact equivalent for the .NET Double type in SQL Server?

Question

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What represents a double in sql server?

Is there an exact equivalent for the .NET Double type in SQL Server? Failing that, is there one which gives a good approximation?

EDIT: It looks like this link gives the most definitive answer: Mapping CLR Parameter Data

Answer 1

It would be float(53):

The SQL Server float[(n)] data type complies with the ISO standard for all values of n from 1 through 53. The synonym for double precision is float(53).

Answer 2

Already discussed HERE.

Answer 3

Use float. See Microsofts SQL-CLR Mapping for other types as well.