I am using multiple layer project where the DataModel hosts the ADo.NET Entity model and DataAccess layer does the validation. However everytime I get a error like this The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. I have tried connec...
I've created an ADO.NET entity data model with Visual Studio and have to assign the properties to a matching table now. If I create the data model with an existing database, Visual Studio uses this database automatically to assign the properties. I have to start with a clear model because I don't have access to the database, the only thi...
Hi, I am just getting started with the ADO.NET Entity Data Model and I was curious as to what was the best way of extending my entities behaviour. Say I have a table called "Customers" and I create an entity model based on this table. I now have a "Customers" entity class. I want to now add some methods to this class and also make it i...
Hi, I have a table structure like the following: Companies Addresses ********* ********* ID ID AddressID ... BillingAddressID ... AddressID and BillingAddressID are foreign keys which are present in the Addresses table. When I generate my model based on this table instead of getting w...
I have no clue how i can get an existing object structure based on the following classes (simplified) into a database using Entity Framework (EF is a constraint, i have to use it). public abstract class WahWahProperty { public string Name { get; set; } public abstract Type PropertyType { get; } } // ---------------- public class W...
I am currently transitioning an application over from LINQ-to-SQL and I've been running into a problem. LINQ-to-SQL offered a way to query any Table/Column-attributed type (which was the default mapping model) through any DataContext through the GetTable<T> function, which analyzed the type and then created the appropriate SQL. Even th...
Hi, in our current project we are using ADO.NET Entity Framework as data layer for the application. There are some tasks which require to run in a transaction because there's a lot of work to do in the database. I am using a TransactionScope to surround those tasks. using (TransactionScope transactionScope = new TransactionScope(Transa...
I have the following method I can pass in a lambda expression to filter my result and then a callback method that will work on the list of results. This is just one particular table in my system, I will use this construct over and over. How can I build out a generic method, say DBget that takes a Table as a parameter(An ADO.NET dataservi...
I just installed the beta for VS2010 Ultimate and I cannot locate the ADO.NET Entity Data Model template. I was under the impression that it as installed, can someone correct this or direct me where I can find it? Thanks. ...
I'm working on a project that uses ADO.NET entity framework as the ORM framework for getting data in and out the database. This all works great, but there's one association that I don't want to map. At least I don't want the developers to navigate from Product to OrderItem using the association between them. Has anyone tried this scenar...
I am unable to delete a record from the the table using ADO.Net Entity Framework. Debugging lets me go through the method without any errors. Cust_DataModel.Cust_DataEntities db = new Cust_DataModel.Cust_DataEntities(); protected void DeleteButton_Click(object sender, EventArgs e) { if (lvCust.SelectedIndex >= 0) { int cu...
I heard about the new entity framework for .net, and decided to modify my code to use this framework, but when I try to add and delete records from the table, an Exception is thrown. I am NEW to this framework, so I can't figure out how to fix this or what is causing the exception. Here is my Code(c#): try { string key = Request.Que...
[I am new to ADO.NET and the Entity Framework, so forgive me if this questions seems odd.] In my WPF application a user can switch between different databases at run time. When they do this I want to be able to do a quick check that the database is still available. What I have easily available is the ObjectContext. The test I am prefo...
I currently have a .NET solution I'm developing that involves several sub-projects, including an ASP.NET MVC project. My model has been separated into a separate assembly because I need to use it from the various other projects in the solution. My model consists of an ADO.NET Entity Framework entity model. I have decided to go with a si...
I've created a database application using C#, ADO.Net and an embedded MS SQL 2008 database file (that attaches to MS SQL 2008 Express) which I created in Server Management Studio. Can someone point me to a resource that describes how I can programmatically create the database file if it is missing (like right after my application is ins...
I have a database with multiple tables, and some basic relationships. Here is an example of the problem I am having: My Database: **Org** ID Name etc **Detail1** ID D1name **Org_Detail1** Org_ID Detail1_ID **Detail2** ID D2Name **Org_Detail2** Org_ID Detial1_ID BooleanField My problem is, the Org_detail1 table is not showing up ...
I have two EF entities. One has a property called HouseNumber. The other has two properties, one called StartHouseNumber and one called EndHouseNumber. I want to create a many to many association between these elements based on whether or not HouseNumber falls between StartHouseNumber and EndHouseNumber. However, I can only seem to get ...
I use ADO.NET Entity Data Model in ASP.NET with MySql. I tried many collocation for my databases and tables but so far diacritics (polish) characters are changed.. for example, from ł to l. And this is at query level (I log all query to file on mysql server level). Any ideas? My connection string does not contain any infromation about ch...
Let's say that I have following situation. I have many customers and many consultans, and each customer has attached only one consultant. So it's one-to-many relationship. I created Edit view which display customer_name and customer_consultant_id how should I update information after post? Just UpdateModel does not work, so something m...
Im using the pre release of Ado.Net and can't understand how I use that with Ado.Net Data Service. The code for the ObjectContext public class TradingContext : ObjectContext { private static TradingContext _Context; public static TradingContext Current { get { if (_...