WinForms TableLayoutPanel ComboBox Not Resizing Properly?
May 14, 2012
I'm trying to use a TableLayoutPanel to align a few controls on a form next to their labels like so:
Label1 [combobox ]
LongerLabel [longer combobox]
But when I run the project and grab the right hand side of the form and shrink the form, the combobox doesn't resize, it gets cut off... Now, I were to not use the TableLayoutPanel, but just anchor a combobox to a form's edges, it will resize properly. What am I doing wrong with the TableLayoutPanel?
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Jan 26, 2010
Resizing a form with a TableLayoutPanel is very slow. The form is blinking and it lasts seconds before the form is resized.To find the problem I do the following:
- Make a new windows application
- Add a TableLayoutPanel with 5 rows and 7 columns
- In Form1_Load every cell is filled with a label control.The property Text is set.
- Run the example
Resizing the form is very slow.
What can I do to make resizing faster? Is a TableLayoutPanel always slow when resizing?
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Jul 1, 2008
I'm using VS2008 and .Net 2.0 on WindowsVista SP1. Whenever I resize my main window, all visible comboboxes are selected/highlighted (like double-clicking the shown entry). The combobox is bound to a dataset, the DropDownStyle is set to DropDown, AutoCompleteMode = SuggestAppend, and AutoCompleteSource = ListItems.
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Dec 15, 2010
I need to put a combobox on a form that displays a list of customers.Each customer has a customer number and customer name.I figured out that VB.NET doesn't have multi-column combo boxes so to get around that I was going to query the data and put a tab between the customer number and name for the display members and have the value member be the customer number:
SELECT CustomerNumber AS ValueMember,
CustomerNumber + CHAR(9) + CustomerName AS DisplayMember
FROM Customers
ORDER BY CustomerNumber
This only works partially in that in the selected area of the combobox, the tab between the number and name shows but when you drop-down the combobox, the tab is not preserved.
Why there is no multi-column combobox native to VB.NET annoys me but that's whole other topic.Does anyone have any ideas for a solution to this problem that doesn't involve getting a third-party control?
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May 21, 2012
I am having issues with a combobox set to:
AutoCompleteMode = Append, AutoCompleteSource = ListItems.
Example: Items in the combo are: "Average", "Good", "Poor". If "Average" is selected in the combo, then I type "G", "Good" will autocomplete. But if "Average" is selected, tab out of the control, then tab back into the control, then I type "A" nothing is autocompleted. It just shows "A" in the combo.
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Feb 10, 2011
I've already found evidence of another having this problem. You can see this on this post by someone else:
http:groups.google...096b3fcaa?pli=1
The problem is that when one navigates the combobox via the keyboard, the combobox's information doesn't update. If you click a value with your mouse, though, everything works wonderfully. The link I've mentioned suggests changing the binding from the Text property to the SelectedItem property. I'm very deep into this project and it would be a bit of a nuisance to change the setup so as to allow it to be bound to the SelectedItem property.What I'm wondering is whether or not I can detect the user changing the selected entry in the combobox and tell VB that they "clicked" the value, if that makes any sense.
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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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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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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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Jan 12, 2011
I have a dilemma whereby I have a form which contains a number of comboboxes that contain information/options/items that may be invalid/out-of-date in certain circumstances.I can't simply remove the out-of-date information from the items, but I do want to give the user a visual-clue when options are invalid.
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May 14, 2012
I am developing a Windows Form Application against a SQL Server relational database. An example of the database schema is:
TableA
------------------
PK A_ID uniqueidentifier
A_NAME varchar(254)
[code]....
In the form I have a ComboBox (cboA_ID) to select the TableA record (DataSource = TableA, DisplayMember = A_NAME, ValueMember = A_ID) and a TabControl where controls on each tab are bound to fields in either TableB or TableC.My question is, is it possible to bind cboA_ID to TableB.A_ID and TableC.A_ID?This is my first database application so if there is a better way to do this I'm all ears. I have set everything up using the wizards in Visual Studio 2010, so I'm still not 100% familiar with what all the various TableAdapters and DataSets do.
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Oct 22, 2010
Allow each item to use multiple lines in a Winforms Combobox (or Listbox)
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Mar 1, 2012
Let me try to describe my problems in the simplest way: I have combobox1 and combobox2. I hope to achieve two things: Combox1 is bound to list1 (a list of string). When a user selects an item in list1, list2 (a list of string) will be obtained from database and combobox is bound to list2.If user specifies text1 in combobox1 and text2 in combobox2, then these two values will be shown in the comboboxes regardless of the bound lists.
[Code]...
So the results of above code is that goal 1 is achieved, but goal 2 is never achieved. combobox1.selected index is always 0 and combobox2.selected index is always 0 too.
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Mar 23, 2012
I have a WinForms app built with VB.Net in VS 2010, and I'm scratching my head over the following issue.I have a form with a combobox which gets bound to a datasource when the form is loaded:
With Me.cboCompany
.DataBindings.Clear()
.DataSource = Me.m_dsBidResults.Tables("Company")
.ValueMember = "company_id"
[code].....
This seems to work fine, as long as the user doesn't switch focus to some other control and then go back to the combobox. After switching focus, if the user then changes the combobox selection to the first item in the dropdown list (SelectedIndex = 0), the SelectionChangeCommitted event fires, but the SelectedValue remains set to the previously selected value. I've verified this by adding a message box in the above event handler, displaying SelectedIndex and SelectedValue side-by-side.
'add this to SelectionChangeCommitted event handler MsgBox(String.Format("Selected Index: {0}, Selected Value: {1}", cboCompany.SelectedIndex, cboCompany.SelectedValue))
This does NOT happen if the user changes SelectedIndex to anything other than 0; everything behaves as expected. I've verified that the table I'm binding to contains unique values for company_id and company_name.Do I need to use some other event to verify that the SelectedValue has actually changed?
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Sep 29, 2011
WInforms Combobox SelectionChangeCommitted event doesn't always change SelectedValue
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Jun 22, 2010
I am looking for a code snippet which opens a image, creates a clone of this bitmap in memory disposes this opened image so that all handles are closed.
Usually we can open a bitmap using this[code...]
the following code however keeps the Image File locked until the application is running, any suggestions how to dispose it properly. (So that no handle is left open )
Things i already tried: use dispose method of bitmap <= doesnt work (need to write implementation)
Using Block also doesnt work.
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Mar 26, 2009
I want to create a 2-high, 6-wide grid with labels in the top row and text boxes in the bottom row. Creating the six labels and the six text boxes is easy. Main Question: How do I stuff them into the TableLayoutPanel at the locations I want?I assume that I write the labels as I would any other label, and read and write the text boxes as I would any other text box.Secondary question: Why do all Microsoft's examples do stuff I never need to do, and never do the simple stuff I need to do?
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Jun 9, 2010
I am using a TableLayoutPanel to display information about a directory of video files. Each file will have 2 rows (a row of info (filename, size, etc) and a row of thumbnails). I can get the row of thumbnails for the files to create correctly, however, the row of information only shows the last file processed.
Dim lbl1 as New Label
Dim lbl2 as New Label
Dim lbl3 as New Label
Dim lbl4 as New Label
[code].....
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Aug 9, 2010
when the form loads, there is a table and i use code to set the row count to a variable from a previous page. this works fine. the problem i am having is that i cant get the row height sizes to be evenly spaced, there is 1 huge row then heaps of tiny ones
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Aug 6, 2009
If I make a TableLayoutPanel and add 10 labels to it like this[code]...
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Sep 20, 2011
I need to change the rowspan, columnspan properties of a control(textbox) when they are within a TableLayoutPanel (net 2008 using c# or vb.net) At runtime the property is not available, but is at design time
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Apr 15, 2010
[Code]...
SubMy problem is that I want to be able to determine the CHECKBOX checked state within this sub. The sub is being called when the checkbox is checked, but I can't seem to find a way to do the conditional.
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Jun 3, 2012
how to Merge two columns in TableLayoutPanel in windows app in .net (vb.net or C#.net)
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Mar 25, 2012
For a winForm I'm building, I'm working with a TableLayoutPanel which has an arbitrary number of Textboxes and two buttons to add or remove boxes, + and -. The + and - buttons appear directly below the Textbox to which the user has given focus like so:
[Code]...
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Jun 1, 2011
I generate controls for a TableLayoutPanel dynamically. I have a delete button in each row. When I click that, that row has to be removed.[code]...
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Feb 19, 2009
In my application i need to resize the TableLayoutpanel dynamically..when i resize this control automatically resize rows and columns equal size. I wrote below code it's working but it's working very slow.
Private Sub tbpanel_Resize(ByVal sender As Object, ByVal e As System.EventArgs)
Try
Dim iColCount As Integer = tbpanel.ColumnCount
[Code].....
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