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Scenario :
  Using XML file as data source for Data driven testing in Visual studio 2010 Ultimate
Error Observed: The unit test adapter failed to connect to the data source or to read the data. For more information on troubleshooting this error, see "Troubleshooting Data-Driven Unit Tests" (http://go.microsoft.com/fwlink/?LinkId=62412) in the MSDN Library.
Error details: Object reference not set to an instance of an object.

Please use following attributes on the test methods:
public void DemoTest()


Make sure to add the XML file as Deployment Item i.e.
1) Add this attribute to the test method 
Or 2) Go to test setting and add the XML file as deployment item Or 3) Right click on the XML file - go to properties of the file and set copy to output directory = copy always
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