title: I changed target .net version and it caused a bunch of data set errors how do i fix it?
body: <p>as the title states i changed the target .net framework from version 4.0 to version 4.6.1 well now my project will not compile.. even after changing the target back to 4.0 it still will not compile!</p>
  
  <p>here are the errors im getting</p>
  
  <p>main form shows</p>
  
  <p>Failed to parse method 'InitializeComponent'. The parser reported the following error 'Invalid symbol kind: Namespace'. Please look in the Task List for potential errors. </p>
  
  <p>at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.OnMethodPopulateStatements(Object sender, EventArgs e)
  at System.CodeDom.CodeMemberMethod.get_Statements()
  at System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, CodeTypeDeclaration declaration)
  at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
  at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host) </p>
  
  <p>build errors shows</p>
  
  <p>Error   CS0246  The type or namespace name 'TrackingNumbersDataSet' could not be found (are you missing a using directive or an assembly reference?)</p>
  
  <p>Error   CS0246  The type or namespace name 'TrackingNumbersDataSetTableAdapters' could not be found (are you missing a using directive or an assembly reference?)</p>
  
  <p>Error   CS0246  The type or namespace name 'TrackingNumbersDataSetTableAdapters' could not be found (are you missing a using directive or an assembly reference?)</p>
  
  <p>Error       Custom tool error: Failed to generate code. Failed to generate code. Exception of type 'System.Data.Design.InternalException' was thrown. Exception of type 'System.Data.Design.InternalException' was thrown.  </p>
  
  <p>any ideas on how i can get it to compile?</p>