C # Open Close database connection

First, forget the SQL Server password, run the statement, you can change the password, remember to check whether the account is disabled

EXECUTE sp_password NULL,' enter new password ',' sa ';

Second, the code: Data source must be added SQLExpress
SqlConnection conn = new SqlConnection ("Server=localhost;data source=.\\sqlexpress;database=doc;user=sa;password= 123456 ");
Try
{
Conn. Open ();

}
catch (Exception e)
{
Console.WriteLine ("Database not connected successfully {0}", e.message);
}
Finally
{
Conn. Close ();

}
Console.readkey ();
}

C # Open Close database connection