If you can use other DB management apps the quickest way would be using a tool like SqlDbx which has a built-in "Export as inserts (SQL)" function (just execute a query like SELECT * FROM Table and then use the contextual menu from the result grid).
If you need to stick to SQL Management Studio then you could use a stored procedure like this one:
http://vyaskn.tripod.com/code/generate_inserts.txt
It generates a set of results with the SQL INSERT statement for each row of the target table. Then you can exports the results to a file, or just copy them to the clipboard and paste in the query window (it works fine even with several megabytes of data).
answered 2010-11-03T01:39:58.397