VS 2008 Datatable Vs Object Binding?
Jan 4, 2010
I've read (or the only book that covers ado 3.5) is Murach ADO 3.5 and throughout the book, the author recommends using object binding so that's what I've been doing. However, I had a chance to look at all the codes for our applications at work, and only datatables are used.Was curious as to the difference/pros and cons between binding to an object, and binding to a table. I guess my real question is which one should I be using, datatable or object binding? Is there a definite answer or does it depends on the situation and what I want to do?
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Oct 15, 2010
With the DataGridView I'm used to just populate them with a list of some object, using the DataSource property. Now I want to just display properties from a single object, and I'm a bit confused on how to do it.. The object is updated through an API event, and I want to select some of the properties for displaying in the DataGridView, to look like this:.where "ValueX" is the name of the properties.Now, what would be my options for binding this to the DataGridView, such that property changes are automatically updated. Since an update also must invoke the control, does that mean I must reassign all bindings, or what logic is necessary in this case?
should I bind to an array, arrayList, stringList, dataTable etc? I guess I'm not sure which type of source will allow binding. Or if I should perhaps build the columns and cells of the grid and populate them "one-by-one" to the properties of the object?
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Feb 17, 2010
Im doing my first project with WinForms, and Im trying to get the DataBinding working. Theres no database in my project, but I'd like to bind some of the TextBoxes to objects' properties. In the other section of this forum (here) I found this line of C# code which does it: textBox2.DataBindings.Add(new Binding("Text", this.myPerson, "LastName"));
my question is can data binding to object properties be set up during design time (without writing code)? If so, how? P.S. I know how I would set up this binding if in WPF, but I'm forced to use WinForms.
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Sep 29, 2011
I have a datatable being returned by my DAL. In my BAL I want to return a class object. So I have a class called BusinessArea that has ID, Description and Active properties. I tried this:
[Code]...
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May 29, 2010
I use objectbinding to display client data in a datagridview. The datagridview also contains a counry-column allowing the user to choose the country of the client.Unfortunately, databinding of comboboxcolumn does not seem to work if an own business class is used. Using a simple collection instead works well.Copy the sample code into a new windows project and the programm runs fine. Then comment and uncomment the two lines with "XXX" and the code will fail. Why and does anybody know how to make the sample code work by using the business object class(variable named "newClientListVariable" in the sample)? [code]
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Jul 10, 2010
how can i bind a dgv with text columns + a combobox column to a datatable?
do i need to use a datarelation for the combobox column?
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Jan 12, 2010
I am trying to bind a simple 2 column data table to a ListBox control with the following code. I am not getting an error but the ListBox is not displaying any items. When debugging, it looks like the DataSource is set to Nothing.
lbAvailable.Items.Clear()
lbAvailable.DataSource = MyDS.Tables("tableAvailableHotFixes")
lbAvailable.DisplayMember = "Name"
[code].....
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Sep 28, 2011
I developed a windows forms app, using VisualBasic in VS 2010. In my form, first I declared a variable as DataTable (Dim VarTable as New DataTable).
Second, changed the DataSource property of my DataGridView (DataGridView1.Datasource=VarTable)
Third, I filled the VarTable in this way: using a resulset from SqlDataReader, i added row by row.
Dim Result As SqlDataReader=CommandSQL.ExecuteReader
Do While Result.Read()
Dim RowToAdd As DataRow
RowToAdd=VarTable.NewRow()
RowToAdd("Code")=Result("Code")
RowToAdd("Name")=Result("Name")
VarTable.Rows.Add(RowToAdd)
Loop
Fourth, after the user changed data in datagridview, I saved the data back to SQL, cleared VarTable (VarTable.Rows.Clear()), and back to top of form to accept a new code. But here, problems begin. When I execute again the whole code described, the datagridview dont show the entire rows, and sometimes crashed with different errors. Solution? Dont fill VarTable row by row. Use VarTable.Load(Result) to populate the VarTable. I don't know why now works, But just I wanted to share this information.
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Apr 4, 2011
I have a select statement and it will go to a datatable object, I would like to do the following
textbox1.text=datatable(first field value)
textbox2.text=datatable(second field value)
textbox3.text=datatable(third field value)
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May 16, 2012
i have two datragridviewcomboboxcolumn,and two textbox column in a datagridview.each combobox column is binded to separate binding source.
column names are sl_no,col_empname,col_empworktype,Col_Hours etc.and
displaymember,datapropertyname,valuemember and for comboxcolumn are
col_empname:-emp_name,emp_id,emp_id
col_empworktype:-worktypename,worktypeid,worktypeid
[Code]...
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Jan 19, 2009
I'm following advice to load data to a DataTable, binding to a BindingSource then a DataGridView. But some exzamples I've found use a DataAdapter, not a DataTable. [code]
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Jul 8, 2009
Am in the process of architecting a new windows forms application, and I intend to use Visual Basic 2008 and SQL Server Express 2005. This is my first application in .Net and I really want to observe the best OOD & OOP principles to create an application that is easy to maintain and extend (add new functionality). My issue is in regard to databinding on the UI. From experience, what do you guys recommend to use for databinding? Should I return datasets/datatables from my Business Layer and bind these to UI controls or should I return Business Objects and bind these to UI controls? And what are the pros and cons of each approach?
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Oct 29, 2011
is there any way that i could link/bind multiple binding source to only one binding source navigator?
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Apr 22, 2009
I have this piece of code that works very well and gives me the path the user's start menu:[code]This obviously uses late binding. Now say I want to do this in C#, or in VB.NET strict mode, neither of which support this kind of syntax with late binding.
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Aug 24, 2010
I have a class:
[Code]...
Now I can change the TextBoxes or the object: MyObject.Two = 3 ..the object and TextBoxes are updated in two ways. Now I want to update the whole object: MyObject = New TestClass(3, 4) ...but this doesn't update the TextBoxes.
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Feb 23, 2009
I am able to get a sql statement to an object. However when attempt to do the same type of code for the stored procedure it does not work.
Public Function ListDMR() As DMRList
Me.Connection()
Dim objALLDMRlist As New DMRList
[code]....
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Jan 18, 2009
Is is possible to bind two BindingList<> object to the DataGridView? Both the bindinglist objects are of the same type. I tried binding an array of BindingLit<> object to the grid, but this fails.
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Apr 30, 2012
I have created a user control in wpf which consists of a textbox and a listview. Now, I want to bind a class object to the list view from the form where I will use this control. So, basically I want to dynamically set the binding for the listview.
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Aug 12, 2011
I have a problem about button click event and data binding.I have described my problem in the mark as following
Public Class Window1
Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
Dim list_of_name As New List(Of String)
list_of_name.Add("John")
[code].....
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May 10, 2009
Is it possible to bind a button to an object? I have a situation where I create lots of buttons dynamically and add them to a form, each button corresponds to a record in a database table, I want the button to hold all the info in the record without the need to search for the data each time I press it. I've already have the info in the tag property as a delimited string, but the process of extracting the info from the string is not efficient. if I add one new value I have to add the code to extract that info using string manipulation. I would rather have an object that represents the record so I can access each value directly.
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Jan 10, 2010
am using VS 2005 and VB. However, if I am not using binding navigator, how can I manage the state of an object it is "added" ( or even "deleted") the property setter is only setting the state to "modified". where should i set it to "added" if i were to insert a new object to a database
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Aug 14, 2011
For adding some images to a WrapPanel, I'm trying to iterate through a collection. My TileCollection contains instances of a Tile class which has a ImageSource property. I've got it by doing all the stuff step by step - Create a new image 1, assign all the properties, create a bew binding 1, assign binding 1 to image 1, add image 1 to the panel, proceed with image 2, ... tons of code I want to shorten now. Here is what I've got so far:
For Each tile As Tile In TileCollection
MainPanel.Children.Add(New Image With {.Width = 80, .Height = 80, .Margin = New Thickness(10), .SetBinding = New Binding With {.Source = tile, Path = New PropertyPath("ImageSource"), .Mode = BindingMode.Default, .UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged)}})
Next
1) ."SetBinding" doesn't work in object initializer expression. Is there any workaround?
2) Is there any way to add a handler in object initializer expression, for e.g. capturing mousedown events?
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Jan 31, 2010
I'm new to programming and am trying to learn how to developed data driven application and was wondering which method is recommended? I know there are some debates out there but most of the books I have recommend using object binding, but it doesn't offer any concrete information on how to implement it. I went to MSDN and most, if not all, the documentations are on dataset. So I guess my questions is, object vs dataset, which do you use?
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Mar 17, 2011
it's about object binding, yes it's just a simple binding. but i don't know why it won't work.for summary, i will write about what i am doing:
1. i have one solution, and have two project in it. WaitressDataWin and WaitressDataObject
2. inside WaitressDataWin, i have 'waitressdata.vb' . this is my simple form , there are some basic textbox (waitress name, address, phone)
3. inside WaitressDataObject, i have 'waitressDataObj.vb' is where i put my object class, i have WaitressName property, WaitressAddress, and Phone.one of my property is like this, others are same except the name of course.
Private _WaitressName As String
''' <summary>
''' Gets or sets the Waitress Name[code]....
4. i create data source , that is object data source. i add reference so i can add my second project which is WaitressDataObject and set the WaitressDataObj as the data source.now i have datasource with three properties (WaitressName, WaitressAddress, Phone)
5. I bind my textbox, by dragging the WaitressName (in datasource) to my waitressname textbox .. so on to all my properties.., i also get bindingsourcecomponent, WaitressDataObjectBindingSource
6. then I put this code to my form load :
dim wdm = new WaitressDataObj
Me.WaitressDataObjectBindingSource.DataSource = wdm
7. done, it should've been worked, but it didn't , i don't know why.. , every time i fill one of my textbox, the properties didn't set the value, i put breakpoint in the 'set' part of all my properties but it never breaks anyway.. (the 'get' part is good, it read my property value when i load the form). so i just had problem in my 'SET' Part.
8. I think i had checked on my variable (word, case sensitive,etc), no problem.
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Aug 9, 2009
Using VB 2005. I am attempting Object Binding, with a validation class that handles the validation at the object properties. But, it is working fine for strings only. For any numbers and dates fields on the form, if I simply enter and leave the text box without entering any data, the validation doesn't kick in. It does only when the text box is dirty (an empty string ?), if I enter something and erase it (backspace), the errorprovider is not letting go unless I fill in something that conforms to the data type of the text box and says the input is not in the correct format / type. And at this point, the object property is yet to be assigned any value, and hence my validation class is yet to activate and do its job.
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Oct 27, 2011
I'm having trouble with some Silverlight functionality. My goal is to get some data from the database and display it in my grid. Sounds simple, however, there are 7 columns that are always going to be there.
The rest of the columns depends on the account. There could be 2 (called Actions) associated with a certain account, compared to another account that could have 5, and the action names can be completely different.
I have successfully been able to return a list of all the possible actions for the given account, and then adding the columns to the grid in the code bihind(VB), and I can bind my data to the grid for all the columns that are already known. The way I store the item's actions, is a Property of type List. My problem is finding a way to iterate through the actions list of the Item object in order to bind those actions to the grid.
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Sep 22, 2011
Custom Object Master-Detail Data Binding
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Jan 11, 2010
VB 2008 .NET 3.5. I have a custom "Shipment" object that contains a list of "ShippingRate" objects. This list of "ShippingRates" is accessible through a property "Shipment.PossibleShippingRates." That property simply returns a copy of the list of "ShippingRate" for that particular Shipment.
My UI layer receives a list of "Shipment" objects from the BLL. This list is databound to a datagridview, and shows details relevant to the Shipment such as Shipping Address, etc.
I want to bind the "Shipment.PossibleShippingRates" property to a combobox, such that when the user changes the grid row, the combobox reflects the "PossibleShippingRates" for that "Shipment."
In addition, I need a way to store the "ShippingRate" they selected from the combobox for later use.
I have tried a few ideas, but none of them work properly.
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Oct 27, 2010
I need to bind a textblock.text property to a single element in an observable collection, or array element, and have the text update using the INotifyPropertyChanged or INotifyCollectionChanged, whichever is best.
Most examples describe ways to bind listboxes or other list views to entire collections, but my application needs to update several textblocks on a screen depending on notification of a change in one or more elements of an array.
textblock1.Text = MyArray(0)...
textblock2.Text = MyArray(1)...
textblock3.Text = MyArray(2)...
textblock4.Text = MyArray(3)...
Is it possible to bind a single textblock to a single array element? Is it possible to get notification of the proper type that will update one or more of the textblocks if any assigned element changes?
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May 18, 2011
New to reports here. Using VB.NET, my application makes use of datatables it creates from a postgresql database.These datatables are defined at runtime rather than design-time, and I would like some way of generating reports from these datatables at runtime as well.
Should I be trying to create the report template at design-time, and then "binding" a datatable to it at runtime?
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