How to check presence of contact in kentico while importing contact through CSV ?

insert before would do the trick. you can see the contact through:

ContactInfo theContact = (ContactInfo)e.object;

if you then look up and find a match you can can the e.cancel() i believe, hopefully it will not stop the entire process. If it does, next option is to clean up your csv by manually importing to a temporary table, selecting any non duplicated contacts using SQL, then take that result and make a new clean csv to pass.

@Trevor Fayas
Thanks for the reply . I tried with the insert_before its not even executing the code block because the the contact form is not a Bizform.So bizform insert_before wont work.

Sorry I should have clarified, you want to use the ContactInfo insert event, not bizform. You're using the wrong hook. Pretty much every class in Kentico has it's own events you can hook into. THis is through the ____Info.TYPEINFO.Events

You want to use the

ContactInfo.TYPEINFO.Events.Insert.Before

Try that!

Thanks for the answer. I will definitely try this code : ContactInfo theContact = (ContactInfo)e.object; Andbal max then I will check if it works or not