I have two combobox, cmbCountry and cmbLocationI have dataset with 3 table, first table for Country value, second table with Location value and then I have table Apartments with IDCountry and IDLocation.I have 2 datarelation, ApartmentCountry, ApartmentLocationThen I bind the last table with cmbCountry and cmbLocation
View 2 RepliesMy question is : If I have two or more fields in table1 pointing to the ID field of Table2...would I be able to set the datarelation between the two tables by setting the 1st relation between table1 to table2 against the relevant ID fields from both the tables and then go on to create and add new datarelation between the same tables again...but this time against the 2nd field from the table1 to the ID field of table2. Or would I need to load table2 that many number of times into the dataset as there are fields pointing to it from the table1?
View 7 Replieslinq querying various nested tables in a dataset? I can't find something like that on the net.
View 1 RepliesMy project currently holds one dataset and several forms. In each form I have dropped an instance of that dataset and certain editors are bound to tables of that dataset instance. Now this means that when each form is loaded I also have to load the relevant data into the dataset instance of that form (basically i am loading the same data more than once).
[Code]...
i have the following piece of VB.NET code:
Dim conn As New MySql.Data.MySqlClient.MySqlConnection(ConnectionString)
conn.Open()
Dim sql = "SELECT * FROM users"
Dim com = New MySql.Data.MySqlClient.MySqlCommand(sql, conn)
Dim ds As New DataSet("dsUsers")
[Code]...
I have a datagridview (parent) and a (well, several) listboxes that I am trying to create a relation with.Datagrid has master records which contain ID fields to lookup tables. The lookup tables are populated into listboxes.I have 1 dataset which contains tables for my datagridview(s) and my listboxes.I need to create the relations so that when they click on a row in the grid, it shows the corrisponding item in the listboxes as well.Problem is, a lot of the ID's in the parent table are empty... so when I try to create the relation, it blows up.
Code: "This constraint cannot be enabled as not all values have corresponding parent values." I'm doing like like so
Code:
lo_relation = New DataRelation("RelationName",DataGridTableIDColumn, ListboxTableIDColumn)
I tried to reverse it, naming the ListboxTableColumn as the parent. That allows the relation to build, but I can't set the Listboxes .ValueMember to that...I'm kind of stumped... as it needs to be a two way relationship.
1) When the parent record (datagridview) changes, it changes the value in the listbox
2) When the Listbox changes, it changes the "value" in the parent datatable so it can be updated.
Would I resolve my issue if I populated the parent with a "default" ID in each field (say 0)... if the database value is null? And furthermore, populate each lookup table with a "blank" default value as well? i.e. First record is ID = 0, Desc = ''?
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].....
I have a list of strings. How do I bind it to a listbox so that the listbox updates as the data of the list changes? I'm using vb.net.I've tried this so far. I've manage to display the data, but not change it:
Public Class Form1
Private mycountries As New List(Of String)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]....
I've also tried this:
ListBox1.DataBindings.Add("items", mycountries, "Item")
But items is readonly, so it doesn't work.Also, if I want to bind the enabled property of a button to a boolean, how can I do that?I've tried this but I don't know what to add for the last parameter.
Dim b As Boolean = True
Button3.DataBindings.Add("Enabled", b, "")
I have an ASP.NET page with a Wizard control containing several steps and about 80 form fields. The data is collected and inserted to a database from the code behind page. I need to set this form up so you can not only insert, but edit a record as well. So I want to databind the fields. I'd rather not use a FormView because then I would have to revise my existing code, since you can't access controls inside a FormView directly. Is there a way to databind the fields without using a FormView?
View 1 RepliesI have a button that i basically want to either show or hide it based on if a certain string has a value or not. I create the buttons in code so i was trying to used databindings with a converter but i can't seem to get the converter on the binding after the value changes. I'm not sure if I'm going after this correctly or not... Here is what i have for creating the button and the binding and the converter. "sFileLocation" is a string inside my class "QuestionsFile". This works for initialization but its just when the value of the string changes, this binding doesn't see the change and doesn't run the converter and all that for me...
Dim btn2 As New Button
Dim b2 As New Binding("sFileLocation")
b2.Mode = BindingMode.TwoWay
[code]....
The thing I don't understand too is that the binding works fine if i just binding the property to the Button.Content. So the property is updating correctly when it gets changed, and the buttons content changes accordingly.
I'm trying to do something with databinding between 2 controls...Here is a sample code (that doesnt work - and that is my wonder):
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Me.TextboxPlus2.DataBindings.Add("Text", Me.TextboxPlus1, "Text")
[code]...
Is there a way to fill a checked list box with data from a sql table and then use the checked items as parameters or a stored procedure?
View 5 RepliesI have an ASP.NET page with a Wizard control containing several steps and about 80 form fields. The data is collected and inserted to a database from the code behind page. I need to set this form up so you can not only insert, but edit a record as well. So I want to databind the fields. I'd rather not use a FormView because then I would have to revise my existing code, since you can't access controls inside a FormView directly. Is there a way to databind the fields without using a FormView? I'm new at this by the way so sorry if the answer should be obvi
View 3 RepliesI want to databind my catagory table to a dropdown list but thecategories aren't going to be in order like:
categoryID Name---------------------1-----------apple2-----------wiper blades3-----------band aids4-----------pear5-----------raisons6-----------tiresHow would I be able to make the list look like:
[code].....
how to add sql statement in my code..here's my code for the form load..[code] want those textboxes to displayed only data for a particular person something like "Select * from Staffapplication where MID ='" & frmLeave.txtUser.Text & "'")how to add the sql statement in my code??
View 10 RepliesWhen the user clicks an "Edit" button on my form, I want a box to come up which allows the user to edit a DataTable in a strongly-typed DataSet. What's the best way to do this?
View 2 RepliesI have code running in the Datatable.ColumnChanging event in my dataset. This dataset underlies a form and conventional drag/drop controls are in place for data entry.when the event triggers and runs, I am running code in the form that checks the dataset.HasChanges property. It is showing False. But this is immediately after the ColumnChanging event has been triggered.Okay, I see by others posts and MSDN that .HasChanges will only be true after moving off the row with the changed column. I have also noted lots of discussion about the advanced binding property of DataSourceUpdate Mode, but that does not address this issue.I guess I can do this by checking the state of the row for the binding source. Just seems odd that the event behind the dataset can be triggered and that does not change the dataset.HasChanges property.
View 3 RepliesI would like to databind to a property that requires arguments.
I thought about defining custom columns and cells because the parameters that the property requires are available from the within the object bound to the row, but I'm having trouble materialising this idea.
As an additional problem, that I think leads on from this, I have also created a custom column and cell for the datagridview that takes the implementation of an interface during it's construction. I have added this column to the datagrid view programmatically (passing the Interface implementation to the column constructor). I've overridden the paint method which evaluates a property from the Interface implantation using arguments from the other rows in the column, but it doesn't seem to call the paint method at all. Even on DataGridView.Refresh(). Essentially I would like this column to also update, evaluate a property from the interface implentation using arguments from the underlying object bound to the row and print this number in the cell.
The reason for this second problem is so that I can implement the interface many different times and just at a column dynamically to display it's evaluation.
Is it better to perform data access operations on the page and then populate the properties of each usercontrol with the retrieved data. Is it better if each UC calls the business layer and pulls its own data independently without having to depend on the page.Existing Conditions:
1. Any information (Querystring, URL, etc) that the page would use for data access is also available to the individual UC's
2. Both solutions utilize caching.
My coworker insists that the first option is better since Data access only happens once on the page. The second option seems more logical to me since it will allow me to place the UC on another page without the need for any additional wiring on the page itself. The page and the UC are truly decoupled.
In this example the IsEnabled property of my button is bound to the selected rows "Local" property of the grid and it works just fine:
<Button DockPanel.Dock="Bottom" Width="100" Height="100" IsEnabled="{Binding ElementName=dataGridRestore , Path=SelectedItem.Local}"></Button>
<my:DataGrid x:Name="dataGridRestore"
ItemsSource="{Binding}"
[Code]...
I am trying to get some binding code working. Bascially I want to bind the IsEnabled property of an element of my grid's context menu with a value of the selected row in the grid.I have it working with this:
<my:DataGrid.ContextMenu>
<ContextMenu DataContext="{Binding PlacementTarget.SelectedItem, RelativeSource={RelativeSource Self}}">
[code].....
I have 2 tables with relation from parent table (customers) and child table (orders) and i have all inside typed dataset.
Now i want a field of customers by datarelation from field child table.
Inside child table i have IDCustomers and i want Customers.FirstName
I think so, inside databinding form designer, inside Text i write
dsMaster.Orders.CustomersOrders.FirstName
I have been developing this VB application for some time now in Visual Studio 2008. I have created datasets, ran into problems, reinstalled them, etc. and have been able to resume work with my application. Just recently, the datasets have completely stopped working meaning no data is pulled from the SQL server. I have tried recreating the datasets with no luck. When I create a new label and try to simply associate it to a SQL field through the properties of the label, Databindings... Text (to pull in the value of the field to this label), when I run the program, it does not pull the data. None of the datasets work. I have checked the code and designer and tried to compare it to my old version and everything looks fine.
View 4 RepliesHow to bind data from database to combobox of winform in VB.NET .
Database : MSSQL server managemant studio
Front End : Vb.net 2008
In the combo box binding,i need to put "Product_gid" in index and "Product_Name" in the value of combo box.How do i add an item "Select" in the 0'th position of Combo box,So that every time i opened the list of combo box,the 1st item will be "Select",other from database.
I have a table called Sort with columnds sortID and sortname. I'm displaying my results in a datalist. I also have a table called Colors with colorid, sortId and shade. On my display I am selecting the results from the Colors table. But for the
SortId column I just have a number. Each sortId already has a sortname in the database. How do I get it so that the display page displays the sortname rather than its corresponding sortId name. Here is what I have: Sincerely, Computergyrl
I have the following code; now i set a propertygrid.selectedobject to the Square object, and start changing the Squares properties. If i change the [Position.x] or [position.y] values in the propertygrid the [Position] and [center] properties update correctly, however when i change the [Center] property, neither [Position] or [Position.x] or [Position.y] update. Is there something else i must do to get this to work both ways. Maybe something is lacking in PointFConverter?
Imports System
Imports System.Collections
Imports System.Drawing
[code]....
I have two datatables inside a single dataset (all are typed). dtOriginalData contains roughly 25 or so fields, which included IDs, descriptions and other bits of data. The ID is the PKey in this case. dtEditData contains almost the same columns as the first,with a couple of extras thrown in. One of the fields in dtEditData is the ID from dtOriginalDatafter the two tables are loaded, I create a datarelation between the two using this ID field. I then update some of the fields in the dtEditData and set their expression to pull data from the Parent table (dtOriginalData) ... this is then fed to a grid. So far everythign works fineNow I need to add some functionality, displaying the Original Data, the Edited Data and the variances between the two.
The bindingContext is set cocrrectly. I've successfully bound all of the edited fields to their appropriate labels, and everything updates as I scroll through the data in the grid.It's all fine and dandy... except.... for the Original Data fields... I bound them to dtOriginalData.... and all I get is the first record displaying. It's not taking into consideration the relation between the two databases and advancing the index on it. So, what I need to find out, is if there is a way to do the databindings so that the two data tables will move in synch with each other, keeping the displayed values updated with the correct information. If, for some reason I can't find a way, I may have to resort to a gawd awful datatable with 30+ fields in it.
I have a class:
<Serializable()> Public Class data
Public _needleCount As Integer = 1
Public percent As Double = 100.0
Public table As DataTable
Public part As String = ""
[Code]...
noticed the strange behavior of Databinding to ToolstripComboBox.Combobox when it is being added to ToolstripDropdown or Contextmenu. Normally I'm binding SQL data to ToolstripcomboBox.Combobox by following code.[code]Though it works perfect on ToolstripcomboBox(es) on ToolStrip or MenuStrip, failed on ToolStripSpiltButton (or) ToolStripDropdown (or) Contextmenu.
View 4 RepliesI am trying to follow an example. I'm getting the following errors:
1. PartNum is not a member of 'Vantage2.OMSDataContext.
2. Name 'Where' is not declared.
3. Method arguments must be enclosed in parenthesis.
4. Name 'p' is not declared.
5. Comma, ')', or a valid expression continuation expected.
For reference, the link is here: [URL]
I have followed with my code as follows...
Class Window1
Private db As New OMSDataContext
Private View As BindingListCollectionView
Private Sub Window1_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
[Code] .....