[SQL]A connection was successfully established with the server, but then an error occurred during the login process

While try to connect to SQL server, I keep getting this error.

Solution is simple but wired, details please refer to William Vaughn’s blog

There are two solutions, I took the simplest one – when exception thrown, try to open connection again.

using (conn = CreateConnection()) {
    try {
        conn.Open();
    }
    catch {
        /*  http://betav.com/blog/billva/2008/11/solution-forcibly-closed-sql-s.html#more   */
        conn.Dispose();
        conn = CreateConnection();
        conn.Open();
    }
    //...
}