Sql Server Mixed Mode

Hello everybody



I program in C# with SQL Server 2005. I need to connect to Server in security mode.

In connection string I supply
UserID = myuser
Password = mypassword
Persist Security Info = True



In Server I set mixed authentication mode,create login 'mylogin' with password = mypassword
after that in my database I create user with username = myuser and loginName = mylogin



There are two problems :

1. in login creation after I fill password, close window and open it again there is old (default) password
but not my password
2. Application fails to connect to DB





How to solve these problems ?

Thank you
Yosef Fishov