SQL LIKE convert to SQL CONTAINS

What is the right syntax for converting a SQL Like to Contains in the following fragment statement:

WHERE ReferenceNo LIKE '%' + @SearchString+ '%'

I have converted it to:

WHERE ReferenceNo CONTAINS(VendorName, @SearchString)

VendorName is in the SELECT statement.

Thanks in advan开发者_运维技巧ce. :)

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If you were just converting the WHERE statement you showed, it would be

WHERE CONTAINS(ReferenceNo, @SearchString)