inheritance - Static methods called with base class property in specflow step from definition file refer to property as null -

i have global base class in solution of tests inherit from, class contain public iwebdriver property. project base class inherit solution base class , initialize iwebdriver property. stepdeffinition class inherit project base class , beforescenario property call project base class testinitialize initialize iwebdriver.

the global base class have testcleanup tag close iwebdriver session uses static method 1 of properties of method iwebdriver, when static method called iwebdriver value null (inside method), although when passed it wasn't.

why static method sees null??

[testclass] public class solutiontestbase {     public iwebdriver webdriver { get; protected set; }      [testcleanup]     public void subbasetestcleanup()     {         if (webdriver != null)         {             webdriverfactory.quitfromwebdriver(webdriver, testsettings);         }     } }  [testclass] public class projectbasetest : solutiontestbase {     public void initialize()     {         webdriver = webdriverfactory.getdriverfromconfig(currbrowser.name, testcontext);     } }  [binding] public class stepdefinitions : projectbasetest {     [beforescenario("consoleanalytics"), datasource(browsersref)]     public void beforeanalyticsscenario()     {         initialize();     } }  public class webdriverfactory {     public static void quitfromwebdriver(iwebdriver webdrivers, testsettings testsettings, int milliseconds = 200)     {          if (/*some code*/)         {             /*              *               * code              * */         }          else if (testsettings == testsettings.local)         {             webdrivers.quit();         }      } } 

you shouldn't mix test setup/cleanup infrastructure between specflow , mstest. specflow test generation tool. generate [test] , [testcleanup] methods , classes should not use them.

if want things happen after tests should use specflow infrastructure ie use [afterscenario] tag in specflow