How to check Valid Email in sqlserver2008R2

Question

Hi ,
     I was created one application using Asp.Net, Sqlser2008 R2 , Actually I have one table named "tblRegisterUser" and have column names are id, email in Sqlserver2008 R2.
id             Email
1        [email protected]
2        [email protected]
3        [email protected]
then When I creating [email protected] then click submit button then I need to display [email protected], [email protected](simillar id created from table) in popup . This is just Warning message. because i need to duplicate Email id.
Please help me If any one knows this bug.

Answer 1

If you want to allo only emails with @live.com, then you can try as below:
Idea is to create a check constraint ....you can also specify more email domains as required too.
create table Test_San
id int,
email varchar(200) NOT NULL CHECK ((email like '%live.com'))-- Or (email like '%gmail.com'))
insert into Test_San select 1,'[email protected]'
insert into Test_San select 1,'[email protected]'
insert into Test_San select 1,'[email protected]'
Select * From Test_San
Drop table Test_San
EDIT: I would suggest you can do these validation at your presentation/application layer at .NET code side which is more appropriate.