If any error occurs in the above process like:
325, Level 15, State 1, Procedure Object Name, Line 4 Incorrect syntax near
'external'. You may need to set the compatibility level of the current database
to a higher value to enable this feature.
Then we have to set the compatibility level to 90 from 80,
which is default, before we create a CLR object in the database.
EXEC sp_dbcmptlevel 'DatabaseName',90