DataSource Controls :: How To Create A Self Association Relation For An Organization Chart Data Tree In Entity Framework

Mar 6, 2010

I,am trying to create a self association relation for an organization chart data tree in Entity Framework,after trying different ways for prevention of exceptions like 3007 and etc. I found that when I put my foreign key in my POCO near Parent and Items navigation properties its work.but I think this is not correct that we have both ParentID scalar property and Parent navigation property. review this and tell me is it correct or not.I'm using VS 2010 RC and ofcource .net framework 4.0 RC

[Code]....

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ADO.NET :: Association In Entity Framework?

Nov 1, 2010

I have 3 tables 1-Category, 2-AssignToCategory, 3-User

Fields in Category (Id, CategoryName)

Fields in AssignToCategory (Id, CategoryId, UserId) -->CategoryName,UserId as forigen key

Fields in User (Id, Fullname)

There is no association defined just used forigen keys.Impoted in EF. Now I want to create association.

1 - Right Click on User and Category for association and 1 to many created UNCHECKING FK checkbox as foriden keys already defined. Relation created than double clicked on relation to assign Principal and Dependent key (Principal (User,Category) and Dependent is AssignToCategory). All done.

Error
Error 1 Error 113: Multiplicity is not valid in Role 'User' in relationship 'UserAssignedToCategory'. Because all the properties in the Dependent Role are nullable, multiplicity of the Principal Role must be '0..1'. c:userslordalidocumentsvisual studio 2010ProjectsCodingCodingModelsCoding.edmx 93 11 Coding

Same error for Category.How do i create association if its not defined on imported tables.

SIDE NOTE: If I removed forigen keys from AssignToCategory and created an association with FK check box clicked so EF put the forigen keys than everything is fine.

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public ForumPost ForumPost(int ForumPostID)
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it works too. But problem is in speed. I not need in RootPost all those includes. So, I should to create one more method like:

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DataSource Controls :: Foreign Key Reference Not Updating With ADO.NET Entity Framework Silverlight/Data Service

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I'm trying to insert a new EF object containing a reference to a related table via foreign key, and cannot get the reference stored in the new object. I have two tables in a SQL Server 2008 Database:

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[Code]....

(Note that _ctCtrl.ComponentTemplate is a confirmed non-NULL object reference to the parent object on which PartGroup is a child)

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[Code]....

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[Code]....

LOOK BELOW PİC : you can understand it :

MY C# codes: [Code]....

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on line:

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[Code]....

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DataSource Controls :: Entity Framework EntityKey (Defaults To 0?)

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CarType
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Name
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If i declare the following

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If i call car_detail.TypeId = 1 then it works fine with the INSERT.

Why doesn't the EntityKey method work?

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DataSource Controls :: Left Join With Entity Framework?

May 17, 2010

how to do this query in EF1:

[Code]....

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DataSource Controls :: Viewing Fields From Two Tables Using Entity Framework

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I have created a .edmx for the northwind database. When I run the following statement, the correct number of detail records are retrieved and I can access the detail fields, but how do I access the order header record to view OrderDate, ShipAddress, etc...?

[Code]....

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DataSource Controls :: How To Save Multiple Rows Using ADO.NET Entity Framework

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public void saveOptionalCourses( ArrayList coursesAdded, int studentID)
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