VS 2005 Deleting Record From Parent / Child Bindingsource
Sep 14, 2011
I have a form with a parent bindingsource showing details and a child bindingsource showing the multiple line items in a dgv. This relationship has the properties set to enforce the constraints and cascade the updates and deletes. When I add a new parent record there is a function for inserting default line items into the child. I have this code fr deleting a record,
[Code]...
edit: jmc posted a nice solution to this problem in the code bank just recently but I could not get it to work in 2005, this line, "AddHandler Me.LOTBindingSource.Adapter.RowUpdated, AddressOf parentAdapter_RowUpdated" throws an error. It say "Adapter is not a member of the System.windows.forms.bindingsource.
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Feb 21, 2010
While I've previously many years of relational databases and procedural languages, I'm stumbling with Visual Basic. In this problem, the simple situation is that I have two files, parent and child. The primary key of the parent file (Area file) is linked by a relation to one of the two fields that makes up the primary key in the child file (Project file) (unique key is formed from 'area' and 'project'). I have the default table adapters created on both files. I have created two maintenance forms showing one each of the two files in datagrid view format.I can create some records in the Parent (Area) file, but when I try to create a record in the child (Project) file, using one of the valid key values from the Area file, I get the 'ForeignKeyConstraint [relation name] requires the child key values [actual value] to exist in the parent table' which I'm absolutely definitely sure it does.
I haven't done any actual coding for those two maintenance forms, just dragged-and-dropped the files from the data sources screen onto separate forms so it creates the controls itself. But I can't work out, if it already knows the data does exist because I can load it back in to the Area maintence form, why it can't check itself to find out the record does exist. Why does it think the record from the parent record doesn't exist? It does exactly the same thing, whether or not the database is in access or SQL Server Express. I have all the latest updates.
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Jul 13, 2011
Working on an VB/ASP website in Visual Studio 2008. Getting the error "You cannot add or change a record because a related record is required in table 'abc'
It is true that table xyz (the target of the INSERT) is in a parent-child relationship with table abc. The PK in abc is a column RequestID_lng. The FK column in xyz is also named RequestID_lng
This is the only relationship these 2 tables are in.
I am trying to add a row in xyz with a value of 45 in the FK. There is already, previous to this action, a row in table abc with a value of 45 in the PK. So the parent already exists for this child.
I have used the watch window to copy my SQL code for the INSERT query that is being executed. I pasted that code into a new query in the Access DB and executed it without problem - it actually added the row that .Net should have.[code]...
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Apr 4, 2009
Instead of connecting to database,I create datacolumns of two data tables.assign foregin key constraints and primary keys to the columns.Add these datatables to dataset and create relationship between them.Now by using RowFilter property,how to display the child table in a datagrid by clicking on parent record in another datagrid?Accept and Award Points Accept as Solution
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Mar 15, 2012
I have this problem : Dynamic SQL generation for the DeleteCommand is not supported against a SelectCommand that does not return any key column information.... the button used to delete record in my project is button6 at the end of the code
My code :
Public Class Form1
Dim con As New OleDb.OleDbConnection
[CODE]....................
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Jan 10, 2009
In VB6, if you put a picturebox on a form and then put a control inside the picturebox, then the control would be a child of the picturebox. Its location would be relative to the picturebox and not the form.If you do the same thing in VB 2005 Express , the control seems to still be a child of the form and not the picturebox (i.e. its location property is relative to the form).Is there any way to make a control or graphic inside a picturebox a child of the picturebox and not the form?
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Mar 10, 2010
I have a user control and a panel on it in Dock fill format. Now this is exposed for the user to add on the form. Till this point fine. Now the user sees lot of events for the user control, which I want to actually link up with the panel on the usercontrol, because that is where I want things to happen . Is there any solution to link up the events in few lines of code than calling each event separately? I am also looking to expose only few events than all the base control events.
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Feb 18, 2011
Im working with MDI parent/child objects. when closing the child objects i need the child to check to see if it is the last child object before closing. i couldn't find anything on google, maybe im searching for the wrong thing.
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Jun 24, 2009
I have a main form, and some sub forms, and each sub form can have some sub forms. When I have multiple sub forms open, and I try to get data from the parent form, it returns the data from the wrong parent form.For example I have two instances of Mainform.subform running. If I do something like this in a child form of one instance of the subform. It returns data from the other subform.
dim l = Mainform.subform.listofdata
Edit:I am using visual Studio 2008. Winforms, form designed using designer. In my mainform I am doing this
Protected Friend frmMain as Mainform
frmmain = new mainform
In frmMain I am doing this
Protected Friend frmsub as new Subform'
frmsub = new subform
[code]....
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Apr 10, 2010
I would like to know if there is some simple code to release a child control from it's parent control, without having to name the parent control. In pseudocode, I'm looking for something like this:
[Code]...
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May 21, 2012
Dim obj_DataTable As New System.Data.DataTable("Category")
Dim obj_DataSet As New DataSet()
'Declaring the array of DataColum to hold the Primary Key Columns
[code].....
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Apr 28, 2009
Applications_Type is a lookup table for Applications.What I am trying to do is provide a drop down list of applications and a label that displays the selected application type.[code]...
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Apr 10, 2011
i have created two forms A and B when button in form A is clicked B is invoked when B is running its not possible to work on A until i close form B. How can i work on A without closing B
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Apr 17, 2012
i have three forms
when i click button1 on form1=====> form2.showdialog()
then click button 1 on form2 =====> form3.showdialog
then click button 1 on form 3 =====>
[code].....
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Nov 4, 2009
I have a datagridview binded with a bindingsource with all the options of editing,saving,deleting enabled.But i am unable to understand the problem that is why the data from my datagridview is not getting saved.This is the code which I am using
Private Sub frmDvdMovieData_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'Library.category' table. You can move, or remove it, as needed.
Me.CategoryTableAdapter.Fill(Me.Library.category)
[code].....
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Jul 9, 2010
I have a table (Projects) which is linked to projectVersions on projectID..projectVersions contains several columns on which I'd like to filter a returned project (and associated projectVersions) list. For example there is a "capacity" column and a "country" column. I am doing a filtered list of projects on one page and I'd like to include all projects where any one of the associated projectVersions has a capacity of 750ml and a country of "France" for example.It may be that a particular parameter is not set and so I pass a zero to indicate not to filter on that.I guess this needs some kind of subquery as when I try and do something like this: [code] it doesn't work as the "xxx" bit, being one-to-many, expects me to specify an item to get at the entities within and yet I want to query where ANY of the associated versions match one of the criteria.
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Oct 12, 2011
I have a listview "CategoriesList" and i have a repeater "NewsRepeater" inside the listview "CategoriesList"
<asp:ListView ID="CategoriesList" runat="server" DataKeyNames="CatID" DataSourceID="CategoriesListODS"
EnableModelValidation="True">
[Code]....
how to pass the catID from the listview and make it as SelectParameters in ObjectDataSource "NewsRepeaterODS"?
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May 27, 2011
Visual Studio Pro 2010 Win 7 64 bit running bootstrapped to a MacBook Pro i5 (blasphemer!!!) works really well though!!New to vb.net, have used vb6 for several years and finding the transition interesting to say the least.I have an access database with a vb.net front end all auto bound by the connection and binding wizards (I know, I know...) Not too complicated, but a simple 2 table related db. On the form the parent table shows customer details with the child table related and displayed by datagrid. I have a field in the child table for images and I have figured out how to store and retrieve images to the db. I am using the datagrid.rowheadermouseclick event to reload the picturebox on the main form as I click down the child table datagrid. Now I need to be able to click the bindingnavigator, go to the next record and have the program reload the image for the next child record. The problem is I'm trying to use an event from either the datagrid or bindingnavigator to reload the picturebox in the child table after moving to the next record, but all of the events I am trying are firing before the next record is moved to and therefor the logic I'm using to retrieve the image from the db is not working.
Anyone with an idea on how to move to the next record and then run my logic to populate the picturebox? What events might I use that fire after the next record has been populated? I know this is probably not that hard, but I have been racking my brain all day now.
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Nov 12, 2010
Note: I am working with Visual Studio 2010 Professional. Note: There are a lot of MDI Child posts, but none (that I have found) that apply to my scenario... Scenario I have an MDI form with a UserControl docked at the top. The UserControl is for navigation and is ~50 pixels in height. When I show a child form with its WindowState property already set to 'Maximized', the child form shows maximized in the MDI parent, but behind the UserControl.
[Code]...
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Aug 18, 2011
I am leaning VB and have created a basic inventory app for work that consist of 4 tables, CurrentInventory, Surplus, Staff and Category. Each of these tables have a corresponding form. My question is with the CurrentInventory and Surplus form/tables. I want a button on the CurrentInventory Form that when clicked the current record would be transferred to the Surplus table and deleted from the CurrentInventory table.I am assuming that I could somehow use the INSERT command to copy the current record to the surplus table but I am not sure how to accomplish this.
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Sep 8, 2009
I have a fairly simple form that uses a SQLAdapter, a DataSet, and a BindingSource to allow users to navigate through the records in a table. Each time the user navigates to a new record, I update a DataGridView control that shows the appropriate records in another table. Now I'm trying to add a new record to the main form, using this code:
bs.AddNew() 'bs is the BindingSource object.
bs.EndEdit()
daCCS.Update(dsCCS,
"tblCostCodeStructures") 'da and ds are the DataAdapter and DataSet, respectively.
dsCCS.AcceptChanges()
Now, this seems to work alright, but it doesn't seem to actually retrieve a primary key for the new record from SQL Server. This is important, because without a primary key there's no way to requery the DataGridView and tell it what the correct Foreign Key is for whatever new records a user may create. I know the code is writing the record, because I can open SQL Server and see the new record, and I can close the form and re-open it to see and edit the new record just fine.
However, I need a way for the new record to be immediately available. Obviously, closing and re-opening a form every time the user adds a new record is not going to work! How can I make it so that as soon as the user creates a new record, that record is submitted to SQL Server, the dataset updated, and the form updated so that I have the new Primary Key field available?
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Jul 28, 2009
I need to move to a specific record. BindingSoucre has MoveFirst, Last, Next and Previuos. It has Find but you can't specify which field to Find in.
What I need is something like the Filter except I just need to move to a particular record based on the value of the primary key.
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Sep 25, 2008
I have a problem with bound controls and a bindingsource. I'm using vb 2008 and .net 2.0.I have a few text boxes bound to columns in the binding source.The backend is a Access database.
I'm using a bindingnavigator to add a new record.The additem event works fine.If the user clicks an icon to cancel edit, the code executes bindingsource.canceledit. This seems to work fine. The row count on the navigator returns to the correct number before the addnew event occurred. However, the bindingsource seems to have an empty record in it. As the bindingsource navigates, it eventually gets to the empty record depending on where it's position was when the addnew event fired.
The error received is an invalidcastexception. This error occurs because the record is repostionedand each time this occurs the code performs calculations using values from the bound controls.But when it navigates to the empty record, the values in the bound controls are null.Is there other code besides canceledit to remove the empty record?
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Mar 21, 2012
I have a BindingSource1 and a DataGridView1.
[Code]...
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Sep 23, 2010
i have a treeview control which i have popuplated with parent and child nodes.What i want to do now is to be able to delete the child nodes if i wish and then the parent nodes.But rigth now i am able to delete the parent node on via the index of the node but with the child nodes it has keys which is the same as its parents node so i can not delete the child node as i will.I am using this code to delete the parent node
[Code]...
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Jul 16, 2011
I have a database with a table that is a child to many other tables. I am using this child table as a datasource for a datagridview. I am using comboboxes to display specific fields in any parent tables, instead of the user seeing the foreign key. Everything is fine. However, I would like to filter the BindingSource based on text matches between any of the fields in the child table and the corresponding fields of the parent tables.
[Code]...
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Dec 17, 2009
I have created a simple application. It contains one MDI parent and one child of its. At load of MDI parent i have also loaded its Child. but problem is with its display. the images of output is attached. Form2 is MDI Parent and Form1 is child.
The code at load of Form2 is:[code...]
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Jun 27, 2012
I have 2 pages. parent.aspx and child.aspx. In parent.aspx, i use colorbox and send some value for the child.aspx to popup.
[code]...
child.aspx will popup and shows ASPxGridView base on the value passing from parent.aspx. User will select the data from ASPxGridView. the selected data need to send back to the parent page. I code it in child.aspx.vb page.My problem is how can i get the value from child.aspx.vb and pass it to parent.aspx ?
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Feb 19, 2009
I have a simple contact book. The application has a main window that's an mdi form. When a contact is added using the "add a contact" form, I want to show a simple feedback message in the parent window status bar saying that the contact was added successfully. Here's the child loading:
[Code]....
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Jul 28, 2010
I am trying to size an MDI form to fit its 2 children perfectly within itself but when I use simple sizing it doesn't work - the MDI form always introduces scroll bars and the children seem to be too big for the parent. My three mDI form methods where this occurs is below.
Private Sub positionSyncForm()<br/>
With m_SyncManager<br/>
.Top = 0<br/>
[Code].....
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