c# - ConnectionString loses password after connection.Open

Question

i'm using ADO.NET to get some information from the database on a server,
so this is what i do:

string conStr = "Data Source=myServerSQLEXPRESS;Initial Catalog=DBName;User ID=myUser;Password=myPassword";

SqlConnection conn = new SqlConnection(conStr);

conn.Open();
// do stuff
conn.Close();

but after calling Open method i noticed that conn.ConnectionString is losing the password so it becomes:

"Data Source=myServerSQLEXPRESS;Initial Catalog=DBName;User ID=myUser;"

which causes exception with any SqlCommand afterwords
how to fix this?
Note:The strange thing is that does not happen always
Edit: i don't think it has anything to do with the command it self but anyway

SqlCommand command = new SqlCommand("select GetDate()", conn);
SqlDataReader reader = command.ExecuteReader();

Answer 1

This is by design, for security reasons. From MSDN:

The ConnectionString is similar to an OLE DB connection string, but is not identical. Unlike OLE DB or ADO, the connection string that is returned is the same as the user-set ConnectionString, minus security information if the Persist Security Info value is set to false (default). The .NET Framework Data Provider for SQL Server does not persist or return the password in a connection string unless you set Persist Security Info to true.