I will be doing an MVVM Project soon and I'm working a couple tutorial/examples out. How do I take the following code and connect it to a database. If I were to have a datagrid, how can I change information in the datagrid and have it automatically update? I'll be using MS SQL.
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I am creating some user controls in vb using winforms. I ran across the observable collection and INotifyChanged events and was wondering if this type of action was available in winforms As I understand it, the observable collection is a WPFapplication, but it would be nice to use this type of functionality in a winform as well.
View 6 RepliesI am using a Dim All_PriceLists As System.Collections.ObjectModel.ObservableCollection(Of BSPLib.PriceLists.PriceListPrime) where PriceListPrime implements Inotify for all properties in it.
I bound the All_PriceList to a datagrid as DataGrid1.ItemsSource = All_PriceLists but when I do All_PriceLists=Getall() where Getall reads and gets the data from the DB, the datagrid is not updating.[code
I'm still teaching myself how to bind and use observable collection. One problem that I'm a little confused on is binding multiple classes/observable collection to one page. In other words, if I have a PersonName class and a AnimalName class, I have to create two separate observalbe collections for each? How would I set the datacontext when a page only allows one?
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Now If I add another class, how would I combine the two on the binding part and collection part.
I've been working on this problem for a while and I'm clearly missing something...I create, populate and bind an observable collection like so:
Dim _ObservableWEI As New ObservableWEI
...
_ObservableWEI.Add(New WEI() With {.WEInum = 1, .WEIvalue = 1})[code].....
The problem is the filter effects the contents of both listboxes. I guess I need a specific instance of the collection to apply the filter too or something
How to sort items in ListView by column bound to an Observable Collection ?I've looked all over the place and I can't find anything easy enough or simple on this.
View 2 RepliesI have a WPF ObservableCollection which is bound to a ListBox and I have a Sort() method which when called will convert the ObservableCollection to a List(Of T), and undertakes a sort based on a date/time column within the collection.
The data is sorted, even when new items are added to the ObservableCollection, however the date/time isn't being correctly sorted. The data is sorting based on the date however it is very much random when it comes to the time portion. The following is an example of the outcomes I am experiencing:
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Is there anything that I am doing incorrectly in this method that would cause the time portion not be included in the sort? Is there a better way of doing a sort?
I have a view model with a property that exposes a collection of things.I have a ComboBox whose ItemsSource property is bound to this collection.Now the user can select from the list.I want to allow the user to clear the selection, so I want to add an item (that is Null) to ComboBox. It's pretty straightforward.
I decided to try and use a CompositeCollection for the ItemsSource so that I could add the items in the existing list to the ComboBox as well as the extra Null item.After fighting with this for a while I decided to return to the documentation on the CompositeCollection Class. I copied their example and the modified it to use a view model instead of Static Resources.
I discovered that no items show up in the list when I bind the CollectionContainer to the list exposed by the ViewModel.I'm not sure how to get around this problem and I'm looking for any advice on this topic.
Here is my XAML code:
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While working with an excel file (.xlsx), the data I get from it is an IEnumerable(of Dictionary). When I bind this to my datagrid, I get the problem that I only see 2 columnsI've been tracing this problem and discovered that in the first row in the excel, there are only 2 values (cell C and D). I think the binding to datagrid looks at this first row to create its headers. This results in my datagrid only showing columns C and D.
View 1 Replieserror in binding
Dadapter = New SqlDataAdapter(dat, conn)
Me.Dadapter.Fill(Me.Table)
bs.DataSource = Me.Table
DgvTire.DataSource = bs
txtserial.DataBindings.Add("text", Table, "serialn")
error: This causes two bindings in the collection to bind to the same property. Parameter name: binding
what should i do with this error?
I'm wondering what the best method is to save the string collection for a AutoCompleteHistory
I do use the feature for Textfield and I can store the entered data in the collection, however I'm not sure how to save this string now
Code:
If Not AutoCompleteHistory.Contains(txtDeviceName.Text.Trim) Then
AutoCompleteHistory.Add(txtDeviceName.Text.Trim)
End If
Do I need to loop through the collection and write the content line by line to a file manually?
I have my datgrid's itemsource binded to a observablecollection. Every 5 secs my client app resceives a list from the server which i use to update the observable collection. The problem is that when it updates the grid seems to reset (if details is open when i update the details collapses, if i have an item selected it will un-select)
Here is the code that i am using to update my observable collection:
Private Sub creategriddata()
Dim svc As New ServiceReference1.Clientthing then re-adding
How to bind a database having 2 or more tables in it using vb.net.
View 1 RepliesI have here a combobx1 that has a value of Mr.A and Mr.B. want that if i choose from my combobox1 the selected value will go to my sql database.
View 2 RepliesI don't know if this is even the correct terminology but I was wondering if it is possible to bind a row (of data) from a database to an object. I am working on a school project and we have decided to create this application to track a user's BMI/BMR and compare it to the amount of calories they have input. The program doesn't go too in depth so it does not store the calories consumed in the database.
So here is my problem. I have a row in my database:
First_Name -- Last_Name -- Height_Inches -- Weight_Pounds
And I guess what I am thinking I want my program to do is if I have an object with properties for FirstName, LastName, HeightInches, WeightPounds, is to somehow query the database for one row and put the values into the object. All we have learned so far is binding the data with controls which doesn't really help in my case since the work is going to be done behind the scenes.
I want to retrieve the selected items in a listbox, save them to a collection, and then use that collection later. I thought that was simple enough, but when I clear the selected items in the listbox, my collections (items, indices) change. I found this out by stepping through the code.
Basically what I'm wanting to do is move items in the listbox up or down (up in this case), and still keep them selected.
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I'm trying to bind a combo box to a Access database field. I'm trying to do this with code instead of using the data sources wizard as I was told that this would be more flexible and better if distributing the finished program to other computers.
The result is that the form runs, but nothing is in the combo box.
I have also not used a dataset in my code, only a data table. Am I correct in thinking that this is plausible?
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
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when I compile the dialog do not have the picture on it...here is the classfile data Tier
Public Class ChemistryDataTier
Private aDataSet As chemistryDataSet
Private aTableAdapter As chemistryDataSetTableAdapters.ChemistryTableTableAdapter
Public Function getChemistryData() As chemistryDataSet
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I was wondering if there is any way to bind TWO different database tables to ONE textbox in VB? I've spent the whole day going through tutorials and different webpages and I've found nothing at all on this...
Well let me try to explain what I want to do exactly: basically I have multiple buttons on 'Form 1' and a textbox on 'Form 2' asking the user to insert a value which will then go to an Access database. But here is where it gets tricky for me: IF the user presses Button 1, the Value inserted on Form 2 will go to a field in the database whereas if the user presses Button 2 to open Form 2, then the value will go to somewhere else and so on.
This would be easy to do if I was to create multiple forms or multiple textboxes, 1 for each button but what I really need is 1 form/1 textbox that would work for all of them... [URL]
I have an ItemsControl in a ScrollViewer. The ItemsControl.ItemSource is set to the Observable Collection.Every time I add an item to the collection, my application nearly doubles in memory usage and eventually after enough adds.
Here is a rough sketch:
<Scrollviewer Name="MyScroll">
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Using ANTS Memory Profiler, I can see all the class instances in my App. When I start the program, I have 150 instances of TextBox (There are three in the datatemplate). When I add a studyunit to the collection, I have 303. Adding another leaves me with 456... 609... etc.The studyunit objects inherits from dependency objects and I am only binding to its dependency properties. I made the studyunit a series of dependency properties due to this article: [URL], but it didn't fix anything.Update 2/22/2010. Here is the actual code (code above was very simplified and created from memory)
Private Sub ObservableCollectionChanged(ByVal sender As Object, ByVal e As System.Collections.Specialized.NotifyCollectionChangedEventArgs)
If e.Action = NotifyCollectionChangedAction.Remove Then 'q removed
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I have a MS Access Database with 2 fields 1) Text2) PictureI want to bind the data from the DataSource to the Dialog FormI have not problems getting the field one to display the text inside a combobox and binding the data to the combobox.I am having trouble getting the .jpg image to display in a pictureboxthe picturebox is Field2 of the datasource...
View 15 RepliesIn ASP.NET, what is the definitive way to pull one record from the database and bind it and HTML tag?
View 2 RepliesI have a form called studentForm which has a studentCombobox, studentTextbox and a studentDatagridView
In the constructor of the studentForm I need to bind studentCombobox to the StudentbindingSource of the main form and to bind studentDataGridView to appropriate binding source in the mainForm.So that this datagrid view displays all the bookings for the studentID currently selected in studentComboBox
studentComboBox.DataSource = MainForm.StudentBindingSource
studentComboBox.DisplayMember = "StudentID"
studentDataGridView.DataSource = MainForm.StudentDataSet
studentDataGridView.DataMember = "Names "
This is the code I wrote in the constructor
I would like to bind different queries for a long set of columns in datagridview that has been set already during the formload, e.g:
With dgvGrid
.Columns(0).Name = "Dept Code"
.Columns(1).Name = "Emp ID"[code]....
there are still more of it. The data needed for those columns is coming from a different table.
I want to bind a column of my database to my textbox's Auto Complete source.now I want to know How to do that?
View 11 RepliesI am struggling to understand fully, I need to bind data from an access database to a datagridview. (the DB simply holds a list of product with their stock code, description etc) I need to bind this datagridview to a products collection without using a dataset to bind to the datagridview. I really don't understand this fully.
View 5 RepliesI am trying to bind data from a text box on my form to a field in my database table. First of all I have created a DataSet, BindingSource and Table Adapter in the forms Design view, but I am having from there. Under the properties of each text box I have set the DataBindings (Text) to the field in the table under the forms instance and DataSet rather than the Projects Data Sources. I am very rusty at Visual Studio 2005 and that is all I have to work with.
View 2 RepliesSo in this gridview, there is a column for status and I want to have a drop down list with Pass, Pending, Fail appear when the edit button is clicked. These values are already in a table, so I need to somehow bind from this table to each ddl for every row.Here is the column from the gridview. As you can see, I would like to just have a label showing when not in edit mode, and a ddl when the edit button is pressed
<asp:TemplateField HeaderText="During Production Status" SortExpression="DuringProductionStatus">
<EditItemTemplate>
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I am trying to bind my SQL param's qurey to bind to a table. My problem is i get this error "Fill: SelectCommand.Connection property has not been initialized."
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
If RadioButton3.Checked = True Then
Dim connectionGrid As SqlConnection = New SqlConnection("Data Source=BST;Initial Catalog=dsfs;uid=dfsdf; pwd='dsfsf'")
Dim commandgrid As SqlCommand = New SqlCommand()
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I am trying to bind an Access database to a MSChart control in VB Net 2008. I have a test database populated with four fields SAMPLE-DateTime, Values-Number, MAX-Number and MIN-Number. I'd like to only display the rows that fall within a specific date range but I'm running into a problem when i try to execute the following command:
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