how i auto create invoice id

Question

how i auto generate invoice id /
how i auto generate Truncation id
(like):- Name=Ram Age=20 Address= Kolkata Cash=5000 due=0
save click then  truncation id / invoice id auto generate into lable box / Text box truncation id=AG002 or   invoice id = DT1340M invoice id = ZS1340M or  truncation id=RK1462P
when due=0 then  truncation id /  invoice id auto generate when click save button .
this is only C# program _Project Plz Help me , i am waiting for ur perfect & clear ans. PLZ send me the sampal project which i see as soon as i understand .

Suthish Nair · Answer

you can use Guid.NewGuid() in c#.

Anil Kumar · Answer

Refer creating auto sequence ID:
Custom Auto-Generated Sequences with SQL Server
http://sqlanddotnetdevelopment.blogspot.in/2011/05/serial-id-auto-generation.html