Pros and cons for using ADO.Net entity model
HI What are the pros and cons for using ADO.NET entity model as a data layer? And should i use LINQ if i'm going to use this technology? Thanks ...
ado.net-entity-data-model
Searching A Parts Table Using ASP.net MVC and ADO.net Entity Data Model gives Error Object Reference not Set to Instance of Object
Good Morning All, I am developing a new ASP.net MVC web application. Part of it's functionality is to search the Parts List on the SQL Server database. I have created a ADO.net Entity Data Model as part of the solution and named it PartList. I'm using master pages and want the search control rendered on it. As such, I've created Par...
Login Failed for User 'NT AUTHORITY/NETWORK SERVICE' when using EntityDataSource with ASP:ListView
Hello All, I have receive the infamous Login Failed for User 'NT AUTHORITY/NETWORK SERVICE' when I try to run a page that contains and EntityDataSource and Listview. Here's Stack Trace: [SqlException (0x80131904): Login failed for user 'NT AUTHORITY\NETWORK SERVICE'.] System.Data.SqlClient.SqlInternalConnection.OnError(SqlException...
How can I add constraints to an ADO.NET Entity?
I know how to mark a group of fields as primary key in ADO.NET entities but i haven't found a way to declare unique constraints or check constraints. Is this feature missing on the designer or on the framework? Thanx. ...
ASP.NET MVC - Easy way to update the strongly typed view, when model adds additional fields?
Existing Model, Controller and View, all working well. Due to a requirement change, there is suddenly a change in the db schema, need to add a few new fields. Database is updated, model (ADO.NET Entity) is refreshed from database and new fields are picked up. Controller is OK since it is working with the "set" and keying off the PK. ...
Update A Collection With Entity Framework
I have a detached set of client objects that I'd like to update (I know they already exist in the db by primary key). Now I want to update them to the database. Knowing I need to query them first, I do so and now have to basically take the properties from the deattached objects and apply them to the attached objects. I finally call sa...
ADO.NET Entity Data Model - Adding custom properties.
Hello, I am new to using the ADO.NET Entity Data Model tool. I have a table in my database that has three properties (FirstName, LastName, Age). I need to add a field to this entity called IsChosen. However, I cannot add this column in the database. How do I add custom properties to entities generated through this tool? Thank you! ...
ADO.NET Entity Framework Quirk
Hi, When I run the code below, it works int charId = int.Parse(Request.Params["charId"]); EveFPT ctx = new EveFPT(); var theCharQuery = from a in ctx.tblChars where a.id == charId select new { ...
ASP.NET MVC View Model with LINQ To Entities
Let's say I create a query result var query = from a in tblXYZ join c in tblABC on a.id = b.id select new {a.x, b.x}; What's the best way to pass that into a view? Should I create a new object and copy the query result into it? ...
ADO.NET Entity 1:1 Navigation Property
Is there a way to get ADO.NET Entity to generate 1:1 navigation properties? If I do foreign keys I always get 1:N navigation properties. ...
Entity Framework - Is there a best practice way to accomplish this?
I have 2 databases and need to transfer data from the 1st database (Read Only) into the 2nd database (Read Write) and am wondering if there is a better way than what I am doing. Still new to EF so don't know all the tricks and would like to learn how to keep my round trips to the databases to a minimum. The code basically responds to...
Updating an MVC application Model along with data-source
Firstly, new to Asp.Net MVC and ADO.NET entity data model. While practicing an example, I created a table but forgot to set "Identity specification" to true for PK. Created a model for MVC Application using entity data Model and worked fine. Later on I've have set that "Identity specification" to true for that table in the DB. When I...
ADO.NET Entity Framework ObjectContext - Caching Question
I was wondering if it was wise to cache the Entity Framework's ObjectContext object in the Cache; will this give me issues with multiple connections at the same time that the user will experience issues with that? I've gotten errors like: 'connection is currently closed' and wondered if that was due to multiple users and caching the Obj...
ADO.NET Entity Framework and LINQ to SQL
Hi, Can anyone answer my question? We are deciding upon the implementation of our Data Access layer. Initially we were working with NHibernate but now there is a change, so please answer my question... IS LINQ to SQL a part of the ADO.NET Entity framework or is it a separate library? If I say I am using "LINQ to SQL" for ...
Entity classes created using ADO.NET Entity Framework?
What is the type of Entity classes created by the Entity Framework which map to the database tables? Are these classes like the classes created using the LINQ to SQL designer and are defined as "partial classes" ...
Entity classes created by Entity Framework and LINQ to SQL
HI , The designer creates Entity classes as partial when using LINQ to SQL and the Entity Framework. Is there some way we can create the Entity classes as .cs physical files while using LINQ to SQL or the Entity Framework ...
EF model from 2 tables connected with junction table - Model don't see records and changes in junction table
I have several tables in my SQL2008 DB, Managers(ManagerID is a PK, incremental) and Customers(CustomerID is a PK, incremental) are among them. All ID columns are int. They are connected with junction table ManagersCustomers(fields: CustomerID is a PK, ManagerID) and there are relations: from CustomerID in Customers to same in junction t...
Linq to Entity Model's DataAnnotations don't reset
In my Asp.net MVC app, I have a custom validator class V and an (ADO.NET Entities) entity model E. class V : ValidationAttribute { public override bool IsValid(object value) { ... if (hasErrors) ErrorMessage = errorMsg; ... } } public partial class E //the entity m...
.NET 3.5 SP1 and ADo.NET Entity Framework
I have .NET 3.5 SP1 installed on my machine and VS 2008. I wanted to work with the ADO.NET Entity Data Model, but when clicking on ADD-> New Item and under data tab I am not able to see the option for Entity data model..Why is it so? Didnt the Ado.NEt Entity framework come with the .net 3.5 sp1? ...
Changing the Name of the Connection String that Entity Framework Uses
How do you change the name of the connection string that Entity Framework models are bound to by default? Let's say I create an Entity Framework data model named "Model1.edmx" by pointing it to a databased named "MyDb" and picking some objects to map using the Visual Studio add new item wizard. The EF model is in a class library project...