ASP.NET: simple mods to existing website

Immediate need for assistance with? an ASP.NET? website that is up & running, but not yet been officially launched.? During testing,? a couple of issues were discovered that need rectifying, notably making a couple of fields on a registration form 'mandatory', and providing some sort of validation on name fields (to prevent input of numbers) and telephone fields (to prevent input of alpha characters) and on email fields (to ensure they have an @ symbol in them).? The form is then posted into a database (which works fine).? It also needs to be sent via email to a couple of email addresses.? It sends OK to one address, but not the other.