Binding Label And Value To ComboBox Winforms
Sep 23, 2010
I have this code
Public Sub FillCategoryCombobox(ByVal categoryList As List(Of tblCategory), ByVal LvName As ComboBox)
LvName.Items.Clear()
Dim itemValue = New Dictionary(Of Integer, String)()
For Each category As tblCategory In categoryList
itemValue.Add(category.CategoryID, category.CategoryName)
Next category
LvName.DataSource = New BindingSource(itemValue, Nothing)
LvName.DisplayMember = "Value"
LvName.ValueMember = "Key"
End Sub
I receive an error on
LvName.DataSource = New BindingSource(itemValue, Nothing)
Value cannot be null
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Oct 27, 2010
In my Winforms application, i've got a form and an associated business layer class. All controls are bound. When i click a button i call a method on the class which then starts a background worker and returns. The background worker does some processing and finishes.
The problem i'm having is that i'm using a label to display any error messages generated by this background worker, which is fine but after a set time i want to clear the label, so for that i'm using a timer (on the business layer class), which, when it fires, is on a different thread and thus should not update the property that the label is bound to Whats the best way to do update the label? -- Should i be using a delegate to update the property value, if so how do i invoke it?Note i'm also having a problem with getting the databinding of the visible property on this label to work.
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May 4, 2011
What is the best way to bind a property to a control so that when the property value is changed, the control's bound property changes with it.So if I have a property "FirstName" which I want to bind to a textbox "txtFirstName" text value. If I change FirstName to "Stack" the txtFirstName.Text also changes to "Stack".
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Aug 24, 2011
You have a pseudo-table class and a pseudo-row class. The row is somewhat generic and has no strongly-typed fields. It follows the typical dictionary interface
Dim age As Object = person("Age") 'accessed via default property Item
vs
Dim age As Integer = person.Age 'an actual property typed as an Integer
What's the pattern to use so that we can bind our pseudo table and its rows to a grid or combo box?
Dim rs As New clsResultSet(tblPeople)
Dim id As Object = rs(0)("Id") '913
Dim name As Object = rs(0)("Name") 'Ted[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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Apr 15, 2010
Dim Member As Integer
Member = Val(MemberID.Text)
'create connecetion
[code].....
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Mar 13, 2009
I'm trying to stack a few lists on top of each other. But the label.size.height appears to be bigger then the label itself. When i set the borderstyle to fixedsingle, i see the border around the text. But the height is bigger, so there comes a space between one label and the next. I have tried to set margin and padding to 0 without result. Exemple: label.size.height return 23, when the height actually is something around 15. Does someone knows how i get the right size? Edit: When i explicitly set the height of the lable, the problem is solved. Is this some problem with autosize?
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Jun 11, 2012
I have a question about the webbrowser control that I hope someone can answer. I am working on a document retrieval and storing class that uses HTML to display and save data. I want to use the webbrowser control in winforms using VB.Net. I only want to store the fields values in the html document, not the whole document. I am hoping to use labels in html and read them with the DOM of the web browser control but am not sure how to do this.
Has anyone done this before and could someone please provide some sample code on how to do this?
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Jan 30, 2011
There is a panel which contains 2 components: a label and a TreeView. The hierarchy, obviously, looks like this:panel1 // handles Enter event
- label1
- treeView1
I need to do some UI updates when user starts interacting with any of these 3 controls. My attempted strategy was to catch the Enter event of the panel, which would fire when user clicks a label, or TreeView. This way, I can write only one (1) event handler instead of several. While it worked for the TreeView, it didn't work for the label. When I click the label, I don't get the Enter event on the panel. Whats different about the label control? I could handle the Click event of the label. At the same time, I wonder what the other solutions might be.
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Jul 17, 2009
I am trying to add 2 databindings to a combobox. 1 will bind to the text, andthe other one will bind to the selectedvalue. However, I am only able to add one databinding to the combobox.
cmdCustomerID.DataBindings.Add(
"Text", TblCustomerBindingSource, "strCustomerID", True)
cmbCustomerID.DataBindings.Add(
"SelectedValue", TblCustomerBindingSource, "idxCustomer", True)
This is what I have done. Only the selectedValue DataBindings.Add is being captured.
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Oct 31, 2011
I have made a vb.net application which has 63 forms. On each form label2 should contain the username using the application. The first form displayed to the user is the login form. When the user clicks the login button on this form the user name in all newly opened windows should appear inside label2. How can I do this?
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Jun 22, 2009
I'm trying to bind CheckedListbox's Cheched items to Combobox my code is given below
Private Sub chklColumns_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chklColumns.SelectedIndexChanged
cmbSort.DataSource = chklColumns.CheckedItems
End Sub
whenever I check an item first time it loads one item to the Combobox, but when I select second item still I have single item in the Combo...
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Nov 25, 2009
I'm trying to bind data to a combo box but it does not appear to be working. I've setup the DataSet and the DataSetBindingSource and all this appears to be working, within the form design I can expand the little arrow in the ComboBox control and preview the data. This appears to be working but when the application is run, nothing appears in the drop down box.
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Feb 24, 2010
I have 2 tables:
Locations
location_refnbr (pk)
location_name
office_refnbr (fk)
[code]....
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Sep 9, 2010
I have combox1 and i want to dispaly Foure Columns in combox1 and I make this
Dim dr As SqlDataReader = SqlHelper.ExecuteReader(conn, CommandType.Text, "select FirstName,FatherName,GrandFatherName,FamilyName from dbo.PersonalData")
Dim dr As SqlDataReader = SqlHelper.ExecuteReader(conn, CommandType.StoredProcedure, "GetSpecialFieldOFPersonalData")
Do While dr.Read
Me.ComboBox1.Items.Add(dr(0) & " - " & dr(1) & " - " & dr(2) & " - " & dr(3))
Loop
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Dec 7, 2011
Is it possible to force a combobox to run it's validation event without moving the focus out of the ComboBox?
I need the event (or an event) to trigger when an item is selected with the mouse or an entry is typed into the combo box. I tried using SelectedValueChanged and SelectedIndexChanged however, these events do not fire if the user types a value that does not exist in the list source. I know I can change the DropDownStyle to DropDownList however, I still want the users to be able to type entries in the combobox (with auto complete).
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Jan 11, 2012
Does anyone know of a simple implementation of a checked combobox in WinForms? I haven't been able to find anything when googling.
I want something that behaves like this windows scheduled task trigger edit:
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May 4, 2009
I have a Winforms application and a combobox has it's datasource set to a DataTable when the form loads. The data displays fine in the combobox. then after a user clicks a button I want to create a new DataTable and assign that datatable as the datasource for the combobox.
The problem is that after setting the datasource to be the new datatable the items in the combobox don't change. Here is the code I'm using.
[Code]...
Does anyone know how to make the correct data be displayed in the combobox the second time I assign the data source for it?
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Jul 15, 2009
I have a combobox with a given width.
It may occur that one row of the data is partially hidden (the combobox might be too narrow). I'd like to show the whole line by using a tooltip or right-click context menu.
Currently I can't find how to 'catch' the row that I'm currently holding on or passing over by mouse.
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Jan 23, 2012
I have a Win Forms app written in vb.neIn it, I have a combo box with an OwnerDraw Item routineUsing this routine, I am able to implement an application-wide default value for a selection color like shown below:This works great except for one tidbit:ction color again in teh textbox portion of the control
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Jul 27, 2010
how one might go about binding to a gridview in ASP.Net 4 in a scenario where the first row of my gridview should be the headers, the second should be a combobox for each column and the third is the beginning of my actual datasource.
If you can imagine what I am trying to achieve is an ability to create a binding between each column in the datagrid and another datasource. This binding is created by the user selecting a value in the comboboxes. However no matter what I try I cant seem to achieve this.
HeaderText1 | HeaderText2 | HeaderText3
ComboBox1 | ComboBox2 | ComboBox3
DataRow1 | DataRow1 | DataRow1
DataRow2 | DataRow2 | DataRow2
DataRow3 | DataRow3 | DataRow3
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Apr 29, 2012
I have set up at DataGridView "cdgvExp" for data entry. cdgvExp.Datasource = ExpTab. The datagridview can accept new rows according to how many entries there are. I will then use the data in ExpTab. The Fourth colum is called "Lot" and is a combobox in the datagridview. The goal is to have the Combobox in the fourth column have the datasource be LotTab which is populated according to other choices in the form. I am hunting for something that would work like an independant combobox like cbLots.datasource = LotsTab
How do I dynamically set the Datasource and Datamember of a combobox that is already set up in a datagridview?
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Jun 3, 2011
My code is:
sqlsub = "SELECT distinct field1, field2"
sqlsub += " FROM tbl I
Dim da As OleDbDataAdapter
Dim lsdataset As New DataSet
[code].....
My prob is how should I bind the combo with field1+"("+ thpr+ ")" thpr is the string i get from function by passing field value 2 from query my combobox should be displayed as field1 + (thpr).
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Jun 3, 2011
I want to retrive data from table into combobox ..when the user click combobox items it's corresponding data will be show.In details :I have PERSON table , my program allow to the user search by : Person Name When the user enters the name into TextBox the combobox items will be all names existed in database same which user entered. when the user selects item from combobox a new form will show all person' data
[Code]...
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Aug 24, 2011
VS2008 targeting .Net 3.5x. I have a combobox with a datasource and display member set, and when I run the project, I see the items. I am also binding the selected item to another object which contains the item upon which I want to select. I have verified that both the bound object and its underlying data contain the value I expect. The problem is that I cannot get it to select the correct item - it only ever selects the first item in the list.
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Dec 3, 2009
I can loop through comboboxes likes:
for i=0 to 5
directcast(me.controls ("combobox" & i.tostring), combobox).items.add ("Hello")
next
However, if I do the same thing with binding sources:
for i=0 to 5
directcast(me.controls ("bindingsource" & i.tostring), bindingsource).movenext()
next
It errors me saying that you can't cast binding source as a control or something (they aren't of the same type). How do I loop through binding sources?
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Jun 17, 2011
I've got a bound Combobox in a database for a lookup but when i set it up and change the data in the combo the program won't let me go and further. There is a data conflict but i don't know where. The problem is here in the combo setup:
Display member : ProductName (nvarChr(20)
Value Member : ProductID (int)
Selected Member: SelectedLookup (int)
This doesn't work. Everything is displayed in the dropdown by name but when i select a item. I can't go any further. If i change the Display member: to 'ProductID' the program works fine. but displays the ProductID where users won't understand. It's like it is trying to store the 'displayed member' Product Name instead in the Value Member 'ProductID'. if i use a list box instead the program works correctly.
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Jan 19, 2010
In a manufacturing environment I'm using an Access database to store properties of manufactured parts. I've queried a table to fill a datatable, which then populates the attached form.
[Code]...
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Feb 24, 2010
[code...]
On my first form, I have a combobox that is bound to the Locations table and displays all the different locations. Once a location is selected, a 2nd form is loaded which has textboxes which are also bound to the Locations table and are populated with the corresponding data.
Here's my issue: on the 2nd form, I have combobox that is bound to the Offices table. Currently, when this form loads all the available offices, displaying with the first office in the list. I need it to populate with the correct office based on the selection made on the combobox on the first form. I guess what I'm asking is, how does one bind a combobox to a foreign key b/c it is the foreign key, office_refnbr, from the Locations table that needs to display in the Office combobox.
I've tried a variety of bindings, including:[code...]
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Aug 23, 2010
enlighten me about how one might go about binding to a gridview in ASP.Net 4 in a scenario where the first row of my gridview should be the headers, the second should be a combobox for each column and the third is the beginning of my actual datasource.If you can imagine what I am trying to achieve is an ability to create a binding between each column in the datagrid and another datasource. This binding is created by the user selecting a value in the comboboxes. However no matter what I try I cant seem to achieve this.
HeaderText1 | HeaderText2 | HeaderText3
ComboBox1 | ComboBox2 | ComboBox3
DataRow1 | DataRow1 | DataRow1
[code].....
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