Web Forms :: Validate Against A Table Of Items?

have a one field webform (Is an "Enter Your Name") field that writes it's data to a table. (Table 1)
I would like to validate the data being entered against another table that I would populate manually (Table 2) , and if the data being entered in Table 1 already exists in Table 2, generate a msg "This Entry isn't allowed), and not let the record be written.The key is that I don't want to do it via a primary key index restriction - I want to manually enter the Table 2 items to validate against.ASP.NET 2.0 VBWe are having a voting system, and if the users get crazy with votes for a particular person, I want to be able to enter that name into another table, and have the 1st table validate against the 2nd... sort of like "This user has had enough votes now !"