DataConnection.ConnectionString Property (Visio)
Gets or sets the connection string that you can use to access an existing DataConnection object or to create a new DataConnection object. Read/write.
This Visio object or member is available only to licensed users of Microsoft Visio Professional 2010 or Visio Premium 2010.
The value of the ConnectionString property for a given DataRecordset object is the same string that you would pass to the DataRecordsets.Add method to create the data recordset.
The easiest way to determine an appropriate connection string for a particular data source is to use the Data Selector Wizard in the Visio user interface (UI) to make the same connection, recording a macro while running the wizard, and then copying the connection string from the macro code.
Setting the ConnectionString property to a new value has no effect on data already in any data recordsets. To update the data in a data recordset using a new ConnectionString setting, call the DataRecordset.Refresh method.