Reading through lines of text file sequencially

[slbit]

I have a text file with hundreds of names i would like to search in the database, yet to perform this query the names have to be on one line separated by commas. the text file is as follows

Mike
Ralph
Cindy
Claire
John

the output i need is

Mike,Ralph,Cindy,Claire,John

Any help on scripting this ?

Thanks

[ghostdog74]

tr '\n' ',' < file

[slbit]

Works Perfectly Thanks