Forms :: Updateable DataGridView Bound To Database-Drive Business Object

Oct 13, 2011

I'd like to have an updateable DataGridView that's bound to a database-driven business object. It needs to handle all aspects of CRUD and be sortable and filterable as well.

Most of them simply bind to an object (non-database, manually filled) and do not allow you to Add, Delete, and Edit records. Furthermore, they basically never show how you would perform sorting and filtering.

I think the biggest things I'm not understanding are:

1) How do you make the DataGridView perform additions, deletions, and edits on an object.

2) How do you program your object to handle additions, deletions, and edits. Do you just need methods that use ADO.Net, NHibernate, or Linq to SQL (or any other CRUD handling mechanism)?

3) How to make this filterable and sortable.

Is this overly difficult to do or why am I have so much trouble finding examples for this?

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Validate Business Object By Use Of Related Business Objects?

Oct 11, 2010

using an object-binding I have a an object representing "Employee". The employee has an ID-property. The ID of the employee must be unique.

My validation of the entered data is handled in the property set part of the object. In general, I validate criteria belonging to the object to validate only (eg numeric range of the ID, if it's value is not empy, ...). But in this case I need to know all ID's from the other employees. My tried this:

''' <summary>
''' Set EmployeeID
''' </summary>

[Code].....

Sort Not Working Datagridview Gives "DataGridView Control Must Be Bound To An IBindingList Object To Be Sorted?

Dec 4, 2009

I have a few classes, one is a form, the other is the source of the datagridview. I want to be able to sort the columns of the datagridview by clicking on the header. Here are the classes that I am dealing with:

Imports DiscoveryByte.AddTools.Misc_Tools
Public Class ViewDiscoveryFlashCards
Private DBBindingSource As New BindingSource

[code].....

Using A Datagridview To Update A Database And The Datagridview Is Bound To A Bindingsource

Dec 12, 2010

If using a datagridview to update a database and the datagridview is bound to a bindingsource which has its datasource as the table to be updated: where dshould you place the tableadapter.update(mydatarow)

Making Multiple Copies Of A Data Bound Object From A DataGridView - How To Decouple Them

May 19, 2009

I have a DataGridView object to which I've bound a list of objects (of type Asset) returned from a database query.I'm programming in VB using Visual Studio 2005.I want to grab two copies of the bound object (calling them oldAsset and newAsset) from the selected row in the DataGridView, update newAsset based on input from other controls on the form, and pass both oldAsset and newAsset to a function that will update the appropriate record in the DB.I try to grab the two copies like this:

Dim currentRow As DataGridViewRow = Me.AssetDataGridView.CurrentRow
Dim newAsset As Asset
newAsset = currentRow.DataBoundItem

[code]....

Opening a watch window on oldAsset and newAsset indicates that the appropriate values are pulled at this point. But when I try to change a property of just newAsset, like

newAsset.CurrentLocationID = cboLocations.SelectedValue

I see that the corresponding value in oldAsset is also changed. This is not what I want, but it's obviously what I'm telling the computer to do.

Forms :: DataGridView DataError Exception When Removing Items From Bound List?

Nov 2, 2011

I am using a DataGridView bound to a BindingSource which is itself bound to a List of objects. This all works well until I remove objects from the list. If I am scrolled down to the bottom of the DataGridView and then remove a bunch of items from the list it is bound to it generates a DataError exception because the length changed and the rows I am looking at no longer exist... I changed my code to handle that error, but now instead of popping up a message it SLOWLY erases the data in each of the newly invalid rows at the end of the table (I think each time it does one it generates a new DataError, which is why it is so slow).

How do I prevent this? I want to be able to dynamically (and programmatically) add and remove items from the table without the possibility of this error... I assumed this would be handled automatically as part of the data binding process but I guess not.

Casting Early Bound Object Type Into Late Bound Object Type?

Jul 5, 2010

I've got a piece of code in a project (MyProject) that contains early bound object from a referenced assembly (We'll call it CommonAssembly):

Dim myObject As CommonAssembly.MyEarlyBoundType

now I have another assembly that is dynamically loaded because it is not present in all projects:

Dim myLateBoundObject As Object = AppDomain.CurrentDomain.CreateInstanceAndUnwrap("Utils", "Utils.MyLateBoundType")
MyLateBoundType derives from CommonAssembly.MyEarlyBoundType, and I want to cast myObject to myLateBoundObject and then programmatically invoke the additional

[Code].....

VS 2005 Insert/Update Database With Bound Datagridview?

Jun 3, 2011

i have an datagridview bound to an access database, the table is empty so i want to use the datagridview to insert and update data to the database.so if i enter a complete row of data, i have an update button that looks like this

vb Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click Dim tableAdapter As HEALTHDataSetTableAdapters = New HEALTHDataSetTableAdapters.HEALTHDATATableAdapter()
tableAdapter.Update(HEALTHDataSet)
End Sub

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DataGridView - Display Two Column Editable Grid Not Bound To A Database

Oct 7, 2011

I need to display an two-column editable grid not bound to a database. I took a look at ListView with Mode=Details, but it appears that only cells in the first column can be edited. I then took a look at DataGridView, and am having two issues:

1. When editing a cell, it adds a new row: [url] How can I prevent this?

2. I don't like the grey background and would like the grid to fill the whole space, right and below.

BTW, if you know of a good tutorial on using the DataGridView unbound, I'm interested. [Code]

View 10 Replies

Dataset Bound Datagridview Not Showing Latest Data From Database

Jun 5, 2011

I am creating one application visual basic and sqlce.I have two forms name Form1 and Form2.

I used Form1 to add data to database using OLeDb command and used Form2 to show data in datagridview by using dataset[code]....

Sharing Business Logic Between Windows Forms And Web Forms?

Feb 4, 2010

My question is, am I able to share a business logic layer seemlessly between the two presentation layers or is there anything I need to watch out for. I'd really like to not have any duplication of business logic, so any advice would be more than welcome.

"DataGridView Control Must Be Bound To An IBindingList Object To Be Sorted" With Dataset

Aug 26, 2009

I'm calling a webservice using the async method, and catching the response with the completed event. When I first open the form, it all runs fine, however the second time I run the form I get the above error when attempting to sort the data.

Strangely, if I comment out the sorting code, it loads perfectly, and I can manually sort the dgv by clicking on the columns.

Code:Private WithEvents Tempws As ws.wsPrivate ID As Integer
Public Sub New(ByVal ID As Integer)
' This call is required by the Windows Form Designer. InitializeComponent()

[Code].....

Operation Must Use An Updateable Query (database Access 2007)

Apr 11, 2011

Operation must use an updateable query (database access 2007)

Create A Business Object?

Apr 19, 2009

Due to a discussion in another thread , I am starting to use business object in an 3-Tiered windows app. As a starting point, I am trying to build objects/classes on a table from my database.

The database table has the following columns:

ID
TypeID
Reference

[Code]....

GUI To Business Object Mapping .Net?

Jun 17, 2009

The issue I'm currently having is mapping multiple GUI fields to object properties (i.e. Presentation layer to Business Logic Layer mapping). To be more specific, this is in VB.Net 2.0 WinForms. The nature of the solution requires us to have 4 columns which exhibit the same type of behavior on our GUI - each column consisting of 11 textboxes (we'll just use this small sample size, as the problem extends beyond 11 textboxes).

What I am currently doing is setting the tag of each textbox in all four columns to a value like so:

Textbox1.tag = "name"
Textbox2.tag = "type"
Textbox3.tag = "speed"

[Code]...

As you can see this can get very bad, rather quickly. Currently we're setting 43 some odd properties that can be mapped to -- thus that select statement is extremely long -- many of which are embedded in multiple methods to try and attempt DRY (I've watered down the code to essentially a conceptual implementation).

Question is: how can I refactor this? I've attempted using a dictionaries/hashes to a certain extent, but it either became overly complex, or just plain didn't make an implementation sense as it convoluted the problem even more.

Bound DataGridView With A DataGridViewComboBoxColumn Bound To A Different Table

Jun 4, 2010

I have a DataGridView that is bound to a DataSet I created from a database table named Contacts. The Contacts table contains a field called StatusId. StatusId is a foreign key to a table called Status. The Status table contains StatusId and StatusName.

[Code]...

Combobox Bindingsource Business-object

Jun 21, 2010

I have a custom business object called Customer and a Form1 with a BindingSource1, NumericUpDown1, TextBox1 and ComboBox1 and the attached code. Setting break points in the Property Sets shows that the Set for the ComboBox never fires at all even though the Set for the NumericUpDown and TextBox fire like crazy. [code]

C# - Building Extremely Lightweight Business Object / DAL ?

Apr 7, 2010

I have completed a simple database for a project. Only 6tables. Of the 6, one is a "lookup" table.There is one "master" table that is the driver for the system. It is referenced as a foreign key by the other four tables.Give that this step is completed. What is the FASTEST, EASIEST way to create POCOs/BizObjects that can load load the data and the child data.Here are my CAVEATS.

I don't want to spend more than 30-60 minutes learning how? There is very little biz logic needed in the POCOs. They will pretty much load data. Don't even really need to write back data.I already know CSLA (up to version 3) but I feel that is overkill for this little project.Nevertheless, I would love it if it ROOT objects could have collection classes that contain the CHILD objects as in CSLA...but again, without using CSLA.

Asp.net - Create Table From A Business Object With Conditional Layout?

Apr 16, 2010

I need to generate a table from a List(Of Students). My Student class has properties for AcademicYear, TeachingSet, Surname and Forenames, is sorted in that order and also properties for ID and start date. The table should nest TeachingSets within AcademicYears and then the students within the TeachingSets, as shown in the table I've mocked up at http:[url]...

Using a repeater I get
08-10 students B74394 Mzejb Bsppn
08-10 students B74395 Lbuifsjof Bvti
08-10 students C68924 Epoob Cmpblf[code].....

Business Model Class Object Relationships And Communication?

May 7, 2012

I'm developing a business model for an application where I am representing physical entities. The hierarchy created from this is neat, but as I'm doing this, I'm beginning to think about things like, what properties should be included in one that may already be apart of another? Or what if some properties are expected to be in one object, but another object needs to return that value, how does it communicate that request through the hierarchical chain? And what is the best practice for this design?

[Code]...

But then I got to thinking, what if I have a ConnectionPoint entity and I want it to return which Panel it has? Should it have it's own Panel association as well? Or should there be a method/pattern for communicating the request up the chain? And again... what's typical best practice?

C# - Serializing A Dataset To A Strongly Type Business Object Property?

Nov 14, 2009

In a vb .net winforms app I am trying out something for "wide and shallow" children of a record. I use strongly typed business objects ( Strataframe ).My plan is to have a number of "child tables" collected in a dataset I drop on the form. they have no correspondence in persisted data, so the dataset is untyped and I am creating the schema through the property sheet for the tables. Each table is the datasource for a datagridview in the interface.

In my proof of concept sample, My main businessobject (CustomerBO) interacts with a SQL Server 2008 table with fields - pk, name, - and a third column which is currently varchar(max) as I considered XML but could just as easily be varbinary(max) if that works better for holding the serialized dataset.

bo.bigfield will be the strongly typed prop I want to hold the byte() array or XML or whatever that represents the dataset for that record.So, the question in a nutshell - how do I convert a dataset to a single datum and reproduce the dataset from that datum. This is my first foray into datasets, datagridviews as well so if there are better ways to accomplish any of that I'm listening.

C# - Applying Attribute To Property In Business Object Such That Column Isn't Visible After Databind?

Dec 29, 2011

I was just wondering if it is possible to apply an attribute to a property within a business object (MyBusinessObject) such that after the DataSource of a grid is set to a List(Of MyBusinessObject), the visible property of the column will automatically be false. For example:

myGrid.DataSource = New List(Of MyBusinessObject)
Public Class MyBusinessObject

[code]....

Forms :: Determine A Dynamic Drive Letter For A Directory On The Removable Drive And Then Open That Directory In An Explorer Window

Feb 19, 2009

First off a short background of the project I am working on- I am developing a program that will be run off removable media (i.e. USB Flash drive). This will be a �virtual desktop� which you will be able to take with you and have the same �desktop� on any system. As we know drive letters can change with each host system the drive is plugged into, I need to be able to determine the path for the flash drive and access a specific folder ( i.e. My Documents)

I have an picture box(representing the icon) placed on my form (form1) and when I click the icon I want to be able to open and view the a specific folder from the portable drive. I need a click event that will determine a dynamic drive letter for a directory on the removable drive and then open that directory in an explorer window.

[Code]....

Connect To SAP Business One's Database On VB 2008 Express?

Aug 4, 2011

On VB 2008 express, how to connect to SAP Business One's DataBase? The Database is MS sql 2008.

DB/Reporting :: Displaying DataGridView Text Column In A Mixed Bound/Unbound DataGridView?

Mar 15, 2011

I have a DataGridView (dgv) on a Windows form (VB.NET) which is bound to a datatable. One of the bound columns is a an ID (Foreign Key) to another datatable. All I want to do is Hide the ID column and populate an unbound column with the Name (ParmName) for the user. I searched the foreign value in the datatable and retrieved the information. I set the Value of the cell in the Datarow. All works well, but does not display. The cell accepts the value...I can even Debug.Print the values to the console. They are there just nothing displaying in DataGridView. Nothing odd about DataGridView. Should be straight forward...

My Code
,
Dim dtParm As DataTable = MyDataSet.tblParameter
Dim dgv As DataGridView = Me.dgvResultNum_DataGrid

[code]....

Bound Datagridview Not Bound?

Jul 9, 2010

There is something strange going on with my datagridview.

I've a data adapter that fills the underlying data table from a database. Then I assign this datatable as datasource to the datagridview Then I add a row to the datagridview and immediately I need to update the table in my database (as soon as user leaves the newly created row).

At this moment I have more rows (+2, not +1) in my datagridview than in the underlying datatable (the new row doesn't exists yet in it so the data adapter .Update method doesn't write anything to the database).

When DataGridView's .RowLeave event fires the undelying datatable is not yet updated. I've a question - is this behavior normal?

VS 2008 Datagridview, 2 Forms, 1 Database?

Mar 22, 2009

I have searched the forums for an answer to my problem, but I have not found any solution.First of all, I know that the datagridview is "supposed" to automatically refresh when new data is entered, but in my case it does not seem to work.

I am using VS2008, with an Access 2007 database. The database has 2 tables, but I am only trying to work with 1 of those tables.For this project I have 3 forms that I am working with. The main form calls a form that has an embedded datagridview for the 1 table in it.

By double clicking on a row, this form hides (Me.Hide()), and the second form appears where the new data is entered for the row selected.

Once the data is saved from the second form, using "Update", the second form hides, bring me back to the main form once again.

If I then click on the button to call up the form with the datagridview, it appears, but not with the new data on it. If I use the "x" button (top right corner) to close this form, and then click on the button to call the form once more, it appears with the correct data.I guess my question comes down to this. Do I need to not use Me.Hide() on this form, and if so, what would I use to make sure that the next time I show the form the data has been updated?

Forms :: Checkedcombobox Selection From Database To Datagridview

Mar 13, 2011

I use vb2010 to create a simple windows form.I have a checkedcombobox which gets its items from a column (titles) from a .mdb database (this works). When I check an item or multiple items in the combobox, I want to display (multiple columns) the title and for example info in a datagridview.

Bound To A List Object Of A Custom Type Via A BindingSource?

Nov 11, 2010

I have a datagridview that is bound to a list object of a custom type via a BindingSource. From everything I've read, I should be able to click the column headers and the rows sort, This doesn't happen for me. Sortmode is set to automatic and the column headers aren't set to be used for selection so it should work.

I know that I could sort progamatticly but that seems a little bit of a waste given that I should just be able to do it by default.

VS 2008 Form With An Object Bound To A Datasource Closes?

Aug 17, 2010

My form closes whenever I insert an object that has a data bound in it. The object I'm trying to insert is a textbox from the data source window (drag n drop). I've checked on the database and that the table has records in it.

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