How to use encrypted DB connectionString at DataSet.xsd?

Hello.

I'm want use DataSet.xsd in .Net Framework 4.5 c# winform project with encrypted connection string.

I execute below

1. adding TableAdapter in DataSet from Designer view
2. connecting TableAdapter with db using by ConnectionString
3. ConnectionString for TableAdapter saved project/settings by plain. no encrypted.

I can redesign code for encrypted connection string from DataSet.Designer.cs/TableAdapter.InitConnection()

and delete plain connection string that stored in project/settings for secure. but it occurs error when execute some command in DataSet Designer view.

I know its natural things. but its neccerary to secure program.

This is the question.

1. How to use encrypted connection string in DataSet designer view without error?