watin - Cannot convert lambda expression to type 'string' because it is not a delegate type -

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w => w.classname == "button" && new winbutton(w.hwnd).title == "ok"

i using class clicks 'ok' on dialog windows opens while testing website on watin. line gives error of lambda expression cannot converted type string because not delegate type.

i have used using system.linq , still not work

please me out!

the whole code follows:

using system; using system.text; using system.collections.generic; using system.linq; using microsoft.visualstudio.testtools.unittesting; using watin.core; using sco.automated.testing.service; using watin.core.dialoghandlers; using watin.core.native.windows; using watin.core.native.internetexplorer;   namespace sco.automated.testing.service {      public class okdialoghandler : basedialoghandler     {         public override bool handledialog(window window)         {             var button = getokbutton(window);             if (button != null)             {                 button.click();                 return true;             }             else             {                 return false;             }         }          public override bool canhandledialog(window window)         {             return getokbutton(window) != null;         }          private winbutton getokbutton(window window)         {             var windowbutton = new windowsenumerator().getchildwindows(window.hwnd, w => w.classname == "button" && new winbutton(w.hwnd).title == "ok").firstordefault();         if (windowbutton == null)             return null;         else             return new winbutton(windowbutton.hwnd);          }     } }

given the code here, looks fine me.

is possible you're using older version of watin doesn't have overload? if in windowsenumerator in reflector, see overload?

public ilist<window> getchildwindows(intptr hwnd,                                      windowenumconstraint constraint)

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