title: What could be causing "an item with the same key already exists" error while adding a data source?
body: <p>I have a VB.NET WinForms application. While adding a new data source, it is giving "An item with the same already been added" on the Add Data Source wizard form.</p>
  
  <p>The application does not contains any existing data source.</p>
  
  <p>What could possibly be causing this error, and how might I go about resolving it?</p>