Is there a possibility to block chance to add the same data to SPList?
I know that two records always are different regarding the ID field.
I would like to validate other custom fields added previously by me, and don't allow of adding same field's value.
Can anybody tell me how to implement this?
I can guess that event receivers could be the answer but I couldn't find how to add a receiver to SPList. Can anybody tel me If I'm right and what is step by step procedure to add such event receiver?
I would like to know how to build it and install it using Feature file.

Best Regards

T.S.