Load Related Entity's From Jump Table?

Nov 11, 2011

I have a jump table to relate the Customers and the contact, I want to load all contacts by a customer name.

Dim Q = From Cust In EnData.Customers Where Cust.CustomerID = ID Select Cust
ContactRow = Q.FirstOrDefault.CustomerToContacts.??? here I'm stock...

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Sql Server :: Display In A Bounded Datagridview A Field From Another Table Related To The Bounded Table?

Jan 20, 2012

i two tables named tblaccess(nID,nRoleID,nModuleID,cAccess) andtblmodule(nModuleID,cModuleName) and i have a datagrid which is bounded to tblaccess. the problem is, I want to display cModuleName from tblmodule instead of nModuleID. please tell me how.

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Related Table Won't Save

Apr 13, 2011

The way it works is for each event, there can be multiple 'disciplines'. So I have a disciplines table related to my events table.

I save an event and save a discipline within it, when I open the application again, the event has saved but the discipline hasn't.[code]...

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.net - Delete Row From Related Child Table?

Feb 5, 2011

I've created a combobox for navigating orders in a grid view.

[Code]...

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ADO.NET Related Table Concurrency Error?

Jan 28, 2009

I get an error when updating a related table, the main table can be updated but the related gives me a concurrency error but I don't know why. Btw I'm the only one using the program and it's connecting to sql server 2005 express.Inserting works like a charm.My piece of code, I hope you get it. The concurrency error is given on Me._objtblOrderinformatieA.Update(Me.objdtsOrders.orderInformatie)

If MessageBox.Show("Bent u zeker dat u deze record wilt wijzigen?", "Orderbeheer", MessageBoxButtons.YesNo) = 6 Then
update_dataset()
Me._objtblOrdersA.Update(Me.objdtsOrders.orders)

[code]....

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How To Delete Row From Related Child Table

Aug 27, 2010

Is there a way to clear all the textbox and combobox in a form without looping through panels and tabpages, because those textboxes and comboboxes were place in a tabpages and panels.

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Load An Entity Framework EntityCollection With Criteria?

May 27, 2010

In Entity Framework (specifically EF 3.5, but if it exists in EF 4 it gives me a reason to upgrade) is it possible to lazy load only part of a collection? I may be approaching this wrong too, so I'm open to suggestions. My tables/entities look similar to this:

[Code]...

The issue is this is loading up the entire collection. Granted it's a small collection so worst case scenario I can load it all up and then remove all but the one I need, but that is far from ideal. Plus I'm not sure if it would be possible without triggering any of the events of modifying the collection since they shouldn't have been in there in the first place.

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Asp.net - Sort A GridView Column Related To Other Table

Jun 10, 2010

i have a GridView bound to a DataView. Some columns in the DataView's table are foreignkeys to related tables(f.e. Customer). I want to enable sorting for these columns too, but all i can do is sorting the foreignkey(fiCustomer) and not the CustomerName.

I have tried this without success(" Cannot find column ERP_Customer.CustomerName "):

<asp:TemplateField HeaderText="Customer" SortExpression="ERP_Customer.CustomerName" >

A tried also the DataViewManager, but i've a problem to detect the table to sort:

Dim daCharge As New ERPModel.dsERPTableAdapters.ERP_ChargeTableAdapter
daCharge.Fill(dsERP.ERP_Charge)
Dim viewManager As New DataViewManager(Me.dsERP)

[Code].....

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Linq Related Table Not Queryable Error?

Aug 17, 2010

I've got a problem with Linq in VB.NET.I've created a .dbml file from my db, and everything looks good - relation "arrows" between tables are visible, etc.But when I want to use simple query (taken from 101 Linq Samples by MS):

Dim q = From h In dc.Hours, w In h.WorkType
I receive an error:

[code].....

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Data Table Only Partially Updates (Parameter Related)?

Jan 25, 2012

I have a data table that I am updating. The table has 5 rows.The first row in the data table that has an ID of 1 will not update with new values, but the rest of the data table does update, I can't figure out why.

It is an access database I am updating, Is there a problem with my Update String? Because it updates all of my table except for the first row that has an ID of 1.

Dim sqlSSRTotalUpdateParameters As String = "UPDATE [SSRTotalChecker_" & FullName & "] SET [Totals]=@Totals,[Category]=@Category,[Materials]=@Materials, [Labour - Field Effort]=@LabourFE," & _
" [Labour - PMO]=@LabourPMO, [Labour - Supervision]=@LabourSuperv, [Labour - Administration]=@LabourAdmin," & _

[code]....

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Typed Dataset Binding Fields Of Related Table?

Feb 9, 2010

I have a typed dataset with 2 tables and a relation between the 2 tables. The relation is a 1 to 1 relation.First, who cane help me how to bind both the fields of the parent and the child table to a textbox.And second, in the dataset designer you cane preview the data. There a see for each record 1 row with all fields of the parent and also the fields of the child table. How cane i have the same result in a datagridview?

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Asp.net - Update A Child Table In Entity Framework

Mar 7, 2012

I have 2 tables in my DB: "Competitions" and "CompetitionAnswers". Each competition will always have 3 answers. I want to be able to edit the Competition and CompetitionAnswers for the same view. I have managed to get the view to work by using editor templates So this is my editor template:

[Code]...

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TextBox.Text To Sql Table Using Entity Framework

Jun 8, 2012

How would I go about getting text from several textboxes and adding them to a new row in a sql table in their respective columns? For instance, I have textbox id's and sql column names of:

[Code]...

The program will be storing the values in a multidimensional array to simulate data from multiple customers. I want each row in the array to be assigned to a new row in the sql table upon the click of a button. I've got everything setup but the writing of the all the textbox values into their own rows in the database.

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Entity Framework 4.2 Table Per Hierarchy Group By Discriminator?

Dec 7, 2011

I am working on a project using an EF 4.2 code first model. This model contains a TPH inheritance structure for products. I need to group the polymorphic results of this inheritance model on the discriminator and am running into some issues.

The entity framework does not expose the discriminator to complete this grouping. My first question is can I get direct access to this discriminator? My reading and experience is telling me no, so I came up with this solution that sort of works. It is not performing well and I am not happy with how it will need to be maintained.

My classes look something like this (simplified):

Public MustInherit Class Product
<key()>
Public Property ProductID as integer

[Code].....

Also, this can give me easy access to shared properties (Name) but now I don't have many options to cast these into their real type, maybe a select case around TypeName.

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Fetch Data From Table Without Mapping It To Entity Model?

May 22, 2012

I am working on a silverlight project in which i am using the entity data model. I have a consol application in the same solution through which i am creating the database table at runtime. Now when i moves to silverlight page i need to Communicate (load
data from newly created tables).But problem is that without updating the model how i will able to communicate with that table at runtime using entity framework model.

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In Entity Framework, We Can Use Model First, DB First, Code First But How Can We Create Table Programmatically?

Jun 9, 2012

In entity framework we can use 3 approaches model first , code first , database first but each one of them needs manual hand touch(means creating database or create model or write the POCO class codes or entity class codes) before proceeding to the next step ( using EF in context ).What if I want to create database and tables and table relationships programatically and still want to have to features of EntityFramework 4.3.

To be more specific ,from this example http://support.microsoft.com/kb/307283 we can create database , tables and everything using SQL command but we can't have the advantages of entity framework. So if we want to have that what should we do? To give the ability to create dynamic table fields those steps will not be sufficient. In all 3 steps database , table and table columns are fixed. There is no way that a user can create new tables or columns dynamically. http:[url].... in this post , it shows how to create manual db, tables and etc using SQL but it is based on ADO.NET but I want Entity Manager to do that.

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Entity Framework - Query Data In A Navigation Property Table?

Oct 18, 2010

I have a the following setup

m_handsets = From p In RL.App.TComEntities.tblTelephoneNumbers _
Where p.companyId = m_CompanyID _
Select p

m_handsets = DirectCast(m_handsets, ObjectQuery(Of RL.TelephoneNumbers)).Include("tblCalls")

where m_handsets is defined as Private m_handsets As IQueryable(Of RL.tblTelephoneNumbers)

which works as expected however what I want to do know is query the Navigation property (tblCalls) so I can do something like the following From p In m_handsets.tblCalls Where m_handsets.tblCalls.price > 100

I think the complexity comes here because in this instance I could have 5 tblTelephoneNumbers in m_handsets and then x amount of calls for that particular telephone number. I am interested in the tblCalls for each but I would like to filter them all for each tblTelehoneNumber.

Entity Diagram which (hopefully) should illustrate further So I currently know all the handsets that are associated with the company I am interested in. I can also see the calls loaded as a navigation property in debug mode, but I want to say is take this filter (in this example price>100 and apply it to all handsets->calls

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Check If LINQ Entity Of Unknown Type Exists In Its Respective Table

Sep 23, 2010

I'm trying to check if a LINQ Entity exists in its table, but at design time I dont know what type that entity is. So I figure I'll just get the table, and try the Contains method on it. But I cant get the table in such a way that I can query it at design time.I've tried the GetTable method on the datacontext, but I dont know how to cast it to the appropriate type when using GetTable(Of). GetTable(Type) works, I just use Entity.GetType(), but then I don't know how to query the ITable thats returned.To try and cast the ITable to something useable, I created an interface(IWhatever) that could implement properties that are native to all of my entities I would encounter. [code]

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Asp.net - Linq Group By An Entity And Then Order By The Grouped (nullable) Entity

Jul 27, 2011

I am trying to build a survey engine from an existing database design which is like this.

[Code]...

The line Order By Key.RecordOrder throws a null reference exception and I can understand why. Can someone advise on how to resolve this by just modifying this one query? I am fairly new to LINQ and the necessity to write this project

[Code]...

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.net - ADO.net Entity Framework - Update Only Certain Properties On A Detached Entity

Jul 22, 2009

I want to update an entity without loading the entity from the database first. I've accomplished this but only by knowing all of the entities properties and then using the "attachto" method. My issues is i don't want my app to need to remember all of the properties. Example:

[Code]....

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.NET Sample Entity Framework 4.2 Code First Entity Splitting?

Dec 14, 2011

Entity Splitting: one class, two or more tables.Here is how it is done in C#, but I need to get it working in vb.net.One more thing: the class name and table columns do not match, so I have to be able to map that out, too.I have to get this to work this way because the place I'm working at right now is a vb.net only shop and the database schema is fubar, but they have so much (millions) of lines of code done directly against the database in both asp classic, vb.net, AND asp.net webforms that changing the schema right now is not realistically possible.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Post>()
.Map(m =>

[code]....

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Data Table - Datagridview - On Running The Code A Second Time The Related Data Is Lost

Aug 6, 2011

I have two data tables. the second related to the first. Using a datagridview for the first table I am able to enter and save data ok. if I run the code twice in a row the data is still there. When I edit the data in the related table in it's own datagirdview the data is there and displays correctly, but on running the code a second time the related data is lost. In both cellendedit events I am using

Me.table.Update(Me.FigsDataSet.table)

Me.Validate()

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Adding Association (link Table Record) Without Creating A New Related Record?

Jul 31, 2011

I have two tables Products and Categories with a many to many relationship. I am trying to copy the categories linked to one product (OriginalProduct) to another product (newProduct). The problem is when I execute the SaveChanges() method, I not only get the records in my linking table, but it also creates another copy of the categories in the categories table. I've tried this in many ways but here are the last couple that I've attempted:

' Copy Product/Categories
For Each oneProdCategory In OriginalProduct.Categories
Dim relatedCategory = _productContext.GetObjectByKey(New EntityKey ("ProductInfoEntities.Categories", "RecordId", oneProdCategory.RecordId))

[code]....

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DataGridView Saving - Set Employee ID In The Related Table In The Grid to The Value From The Employee Record?

Sep 15, 2009

I have a VB project with a form where user adds/modifies the data, data are stored in SQL. On the form there are 2 tables that are linked by employee ID. When I test the process and insert a new employee record and add new comment for this new employee in DataGridView - when I save it I get an error that "Object reference is not set to an instance of an object". During more detailed debug it says that CurrentCell is set to Nothing - even that I do have values in all fields.I do set employee ID in the related table in the Grid to the value from the employee record - so all primary keys do have value and the comment is saved after all but I get an error and saved comment dissapears from the screen right after saving. When I pull the same new record again - everything is saved. What am I missing and how to avoid the error and dissapearing of the saved comment?

Also - I tried to save the new employee data in the first table first and then add comments - it didn't solve the problem. But if I add first part of information in the main table, save and close the form, then go back and add comment - it works fine. The problem is - it's not convenient for the user - they'd like to enter everything at once.

Private Sub TblCommentsBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TblCommentsBindingNavigatorSaveItem.Click
Me.Validate()[code]....

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Cannot Add Or Change A Record Because A Related Record Is Required In Table?

May 11, 2011

I'm receiving the following error:"You cannot add or change a record because a related record is required in table 'FORN_NIB'."

I cannot understand this error fr the related record really existe on the FORN_NIB table. It is even picked up from there. Here's the code where the error occurs at the .Update instruction:

HTML With rst
.Open("DADOS_RECIBOS", conn, ADODB.CursorTypeEnum.adOpenDynamic, ADODB.LockTypeEnum.adLockOptimistic)
.AddNew()
.Fields("NUM_FORN").Value = Me.TextBox1.Text

[Code]...

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Replace Column By A Related Column From Another Table In DataGridView

Dec 14, 2011

I have:

- Table1 with columns: PK_ID1, LOCATION, DIRECTOR, SELLER, SELLERID, WORKTIME (relationship), WORKCODE

- Table2 with columns: PK_ID2, WORKCODE (relationship) & WORK_DESCRIPTION

My DataGridView do a SELECT * FROM Table1;How can I replace WORKCODE with WORK_DESCRIPTION in DataGridView, please?

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Asp.net - Using ExecuteQuery() With Entity Framework, Entity Class

Jan 16, 2011

I am trying to jump from ASP Classic to asp.net. I have followed tutorials to get Entity Framework and LINQ to connect to my test database, but I am having difficulties figuring out ExecuteQuery(). I believe the problem is that I need an "entity class" for my database, but I can't figure out how to do it. Here is my simple code:

Dim db as New TestModel.TestEntity
Dim results AS IEnumerable(OF ???) = db.ExecuteQuery(Of ???)("Select * from Table1")

From the microsoft example site, they use an entity class called Customers, but I don't understand what that means.

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C# - Inherited Entity Item Not Recognized As Entity?

Feb 11, 2011

I am trying to create a generic typed class, but am running into a problem. Here is my basic class definition:

public class QueueObject<T> where T : System.ServiceModel.DomainServices.Client.Entity
{
public string LoadingMessage { get; set; }
public System.ServiceModel.DomainServices.Client.EntityQuery<T> Query { get; set; }
}

I am trying to add instances of this class to a queue

private Queue<QueueObject<Entity>> _queue;
this._queue.Enqueue(new QueueObject<MyEntity> {Query = MyContext.GetMyEntitiesQuery(), LoadingMessage = "Loading some stuff"});

This doesn't work. I get an error saying that QueueObject cannont be converted to QueueObject. I don't understand because MyEntity inherits from Entity.

Public Class QueueObject(Of T As System.ServiceModel.DomainServices.Client.Entity)
Public Property LoadingMessage As String
Public Property Query As System.ServiceModel.DomainServices.Client.EntityQuery(Of T)
End Class

[code]....

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Load Data From Table For Some Action?

Jan 19, 2012

i need to show data from a table in a control upon which when the user selects a particular record a box should be displayed and he would add his comments for the selected record. I do not know how to pull the record and show it in which control>

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Load Dates From Table Into Monthcalendar?

Oct 13, 2011

My table looks like: Id | _date | about The "_date" is formatted like: 2011, 10, 17 and the "about" is simply text.[code]...

1) I keep getting the error that my command is incorrect. I don't see what's wrong with it.

2) how do I fill the monthcalendar with the dates? (row _date)

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