From Session to GUID and back

I would like to insert a GUID into my table, then pass that variable to another page where I will use it in an email validation. Is this how you create a GUID?
Dim validid As Guid = UniqueIdentifier  
Is this how I would insert it into my table?
 
Dim pvalidationid As New SqlParameter("@validationid", SqlDbType.UniqueIdentifier) pvalidationid.Value = validid ...