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Month: October 2011

How to list all entity names / table names from your Entity Framework model in Silverlight 4 and RIA services

25 October, 2011 Roel van Lisdonk 1 Comment Uncategorized 11:20

If you want to list all entity names / table names from your Entity Framework model (*.edmx) in Silverlight 4, use a RIA Invoke operation:   using System; using System.Collections.Generic; using System.Linq; using System.Web; using

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Solving: Add and delete buttons on the DataForm are disabled when using an List<Entity> as ItemSoure

25 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 11:13

  When you bind the DataForm.ItemSource directly to an entity set returned from your RIA DomainService, the DataForm add and delete buttons are disabled. This is caused by the implementation in RIA Services of the

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Solving: DisplayName not showing in a DataForm in Silverlight 4 by using data annotations on a metadata class.

24 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 15:40

I was trying to change the displayname of a field in a dataform by placing the DisplayName attribute on the property in the metadata class. This will not work instead you must use the [Display(Name=

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Solving: "Could not activate cellular data network" on a Vodafone iPhone 4 after iOS 5 upgrade.

20 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 20:55

After updating mine Vodafone iPhone 4 to iOS 5, all was working well, except no data connection. Error: Could not activate cellular data network. You are not subscribed to a cellular data service. I found

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Resolving: Validator.TryValidateObject always returns true in a UnitTest, when using a MetadataType class in Entity Framework 4

19 October, 2011 Roel van Lisdonk 2 Comments Uncategorized 14:16

When you use a metadata class in Entity Framework the registration between the entity and the metadata class is not registered for all Microsoft Visual Studio Project types (the "test project class library" for example).

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Generating metadata files for your Entity Framework model with a t4 template.

18 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 17:00

If you want to generate metadata classes automatically bases on your Entity Framework model, you can use the http://t4metadatatemplate.codeplex.com

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Solving: No microphone sound in Skype, when using remote desktop in Windows 7: No audio devices are installed.

13 October, 2011 Roel van Lisdonk 15 Comments Uncategorized 17:12

I was using Microsoft Remote Desktop on a Microsoft Windows 7 machine to remotely control an other Windows 7 machine an I was running Skype on the remote machine. There was coming sound through the

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Solving: Running a unittest in the current context [CTRL + R, T] will not rebuild the Microsoft Visual Studio Test project.

11 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 14:04

Normally when you alter code in your Microsoft Visual Studio test project, pressing [CTRL + R, T] will rebuild the project and will execute the correct code. In my case altering the code in the

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Solving: The attachable property ‘Behaviors’ was not found in type ‘Interaction’

11 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 13:48

  I was getting the error: The attachable property ‘Behaviors’ was not found in type ‘Interaction’. This was generated by a missing reference to the "System.Windows.Interactivity" assembly.   You can download the assembly at http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3062

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Solving: Invoke operation ‘MyOperation’ failed. Unable to load the specified metadata resource.

7 October, 2011 Roel van Lisdonk 0 Comments Uncategorized 08:25

If you encounter the error: “Invoke operation ‘MyOperation’ failed. Unable to load the specified metadata resource”. Please check the connection string used by Entity Framework. In my case, I changed the namespace for the *.edmx

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