Hi,<br> <br>We build an own silverlight library that is able to write a text file in isolated storage.<br>Blend prompts MissingMethodException for IsolatedStorageFile.FileExists.<br><br>I added code to prevent accessing isolated storage at design time and the problem disapeared.<br><br>Is that a bug or is that a known limitation that IsolatedStorageFile is a runtime class only?<br><br>thanks in advance.<br><br>Ralf© 2009 Microsoft Corporation. All rights reserved.Sat, 15 Nov 2008 22:05:52 Z5c93a895-b967-4832-a818-82d4d2b780dbhttp://social.expression.microsoft.com/Forums/en-US/blend/thread/5c93a895-b967-4832-a818-82d4d2b780db#5c93a895-b967-4832-a818-82d4d2b780dbhttp://social.expression.microsoft.com/Forums/en-US/blend/thread/5c93a895-b967-4832-a818-82d4d2b780db#5c93a895-b967-4832-a818-82d4d2b780dbRalf Dobslawhttp://social.expression.microsoft.com/Profile/en-US/?user=Ralf%20DobslawHi,<br> <br>We build an own silverlight library that is able to write a text file in isolated storage.<br>Blend prompts MissingMethodException for IsolatedStorageFile.FileExists.<br><br>I added code to prevent accessing isolated storage at design time and the problem disapeared.<br><br>Is that a bug or is that a known limitation that IsolatedStorageFile is a runtime class only?<br><br>thanks in advance.<br><br>RalfWed, 12 Nov 2008 16:29:28 Z2008-11-12T16:29:28Zhttp://social.expression.microsoft.com/Forums/en-US/blend/thread/5c93a895-b967-4832-a818-82d4d2b780db#0aaaf878-162b-45f6-887a-9d686be0b9e9http://social.expression.microsoft.com/Forums/en-US/blend/thread/5c93a895-b967-4832-a818-82d4d2b780db#0aaaf878-162b-45f6-887a-9d686be0b9e9Unni Ravindranathan MSFThttp://social.expression.microsoft.com/Profile/en-US/?user=Unni%20Ravindranathan%20MSFT Yes, there are few types (WebClient, IsolatedStorage, etc.) that won't work correctly on the design surface, and you are doing the right thing here (preventing the code from running on the Blend design surface).<br><br>Thanks,<br>UnniSat, 15 Nov 2008 22:05:52 Z2008-11-15T22:05:52Z