Inheriting Combo Control - Unable To View Any Item?
May 18, 2009Hi, I am inheriting the telerik radcombo control however I am unable to view any items that i add to the combo list.
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View And Add Sub Items Of Each Item Of The Combo Box?
Feb 10, 2010i recently add two combo boxes in my form. the first combo box contains the categories of movies. and the other one is the list of movies sorted according to the category of movie. i just wondering how i could i add and view movies for the second combo box, when i click one of the category of movie.
View 2 RepliesMy Program Isn't Selected The Right Item That Click On - Allows A User To View A List Of Foods In A Combo Box
May 1, 2012I am creating a program that allows a user to view a list of foods in a combo box, add that food unto a list box, and adds all of the calories of that food together. When the user highlights their select food, the program automatically shows the amount of calories for that particular food in a text box. The program is getting the food and calorie information from an access database. I managed to get all of the food calories to add up properly, however, I ran into a problem. Sometimes, well, most of the time, when I select certain foods from the combo box, the program automatically reselects another random food, usually a food that begins with either an A, B, or C. Also, the other random food that the program chooses usually has the same amount of calories as the food I originally wanted to choose. I have over 6,000 items in the database. I don't understand why this is happening. This is what my code looks like for the button that adds each food to the list box:
Private Sub Button4_Click(sender As System.Object, e As System.EventArgs) Handles Button4.Click
Foods_Selected.Items.Add(ComboBox1.Text)
Static i As Single
[CODE]...
And this is what my code looks like for the button that adds all of the foods together:
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim x As Single
Dim TotalCalories As Single
[CODE]...
I have no idea what to try. It's like the program just skips over random foods, even though all of the information for them is in the database.
Can A Custom Control NEW Sub Be The Only One That Executes When Inheriting From An Existing Control
Jul 17, 2011Can a custom control NEW Sub be the only one that executes when Inheriting from an existing control please?I am Inheriting from TabControl and I do not want the base New Sub called, is this possible?In other words, I do not want TabPage1 and TabPage2 to be added.A Form has an Activated Sub which runs once a Form is activated.It is a pity that Microsoft have not got such a method in the baseControl Class otherwise I could have used it within a custom TabControl.
Public Class Form1
Private Sub Form1_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
End Sub
[code]....
Inheriting From A Custom User Control
Oct 28, 2011I have a component class that inherits a user control class and i'm trying to inherit from that same class in a new class.public class B inherits class Unfortunately, I get an error pointing to the .g.vb file saying:Base class 'System.Windows.Controls.UserControl' specified for class '...' cannot be different from the base class '...' of one of its other partial types When I swap the "Inherits System.Windows.Controls.UserControl" with inherits from the base class in .vb files the program compiles but when I try to access any of the components I get an error saying "Object reference not set to an instance of an object."Why is it doing this? it's as if the my sub class isn't inheritingUserControl method at all.
View 2 RepliesForms :: Selected Item In Combo Box Will Not Appear In Another Combo Box?
May 27, 2011how do i program by saying if a certain item is selected in a combo box then that item will not appear in a second combo box. i have this code for now but it does not work
[Code]...
Inheriting Forms - Expose Control Events?
Nov 2, 2009I am using an inherited form extensively for the first time, and I'd like to know if what I'm doing is correct.I have a base form with a grid and four buttons (Add, Edit, Remove and Close). There is no functionality in any of the button click events, as the specific implementation of each derived form will be different. The only exception perhaps is that the Close button closes the form. The only reason I am using a base form really is because I've many forms that look the same.How do I now expose the button click events to any derived forms? The only straightforward way I could think of was to have the button click events call an Overridable method, which I then override in the derived form:
Public Class frmTableBase
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Me.AddButtonClicked()[code]...
Is that the correct way? It seems a little bit overkill to have to do this, although I can't think of another way really... Perhaps I could add the Overridable keyword to the event handlers themselves (and make them public)..?I'm doing it the way I showed now however. It works, but I'd just like to know if this is the generally accepted way of doing this.
Custom Control Inheriting From TextBox Does Not Fire Paint Event
Aug 25, 2010I need a multiline TextBox which is always disabled, but it shouldn't paint itself in gray, but I want to keep its designer choosen color. I previously had the same requirement with an always-black Label (no multiline) and so I inherited from Label like:
Imports System.ComponentModel
Public Class LabelDisabled
Inherits Label
Sub New()
InitializeComponent()
Enabled = False
End Sub
[Code] .....
But this way, neither I can set the "real" Enabled property, I mean the backing field.
Selected Item In Combo Box Will Not Appear In Another Combo Box?
May 27, 2011how do i program by saying if a certain item is selected in a combo box then that item will not appear in a second combo box i have this code for now but it does not work
j = 0
Do While j < cmbSession.Items.Count
If (j <> lesson) Then
[code].....
Inheriting Class Or Control - ListView, TreeView - Distinguish Between Built-in Methods/property/events
May 15, 2012When inheriting class or control e.g. ListView, TreeView, etc..., what is the best way to distinguish between built-in methods/property/events and mine?
Currently, i start my methods/property/events with "aa" in order to make them at the top of auto complete list.
Using Inheritance-Based Controls - Creating As New Classes (not UserControls) Inheriting From An Existing System Control
Oct 15, 2011I seem to be having a problem with controls that I am creating as new classes (not UserControls) inheriting from an existing system control. Everything seems ok while I create the control code, through to the compile (which is successful and adds the control to the toolbox) and dragging the control from the toolbox to the GUI surface. However, when I then debug or compile the project, I get a message such
[Code]...
How To Get Length Of A Particular Item, For Example Item No. 5, In A Combo Box
Oct 18, 2010How to get length of a particular item, for example item no. 5, in a combo box?
View 1 RepliesBind The Combo Box Through Details View?
Mar 15, 2012i am trying to bind the combo box through details view in vb.net but unable. i am making a login form and i want to display two values e.g usertype admin , employee in combobox but when i run the form it doesnot show me anything in combo box although i have selected the true binding source and display member but still unable. Another problem is in my form load event if i left this line written
Me.StaffTableAdapter.Fill(Me.StaffDataSet.staff)
it not only shows me the combo box values but also types in the user name and password which is saved in database. All i wana do is when the form gets loaded ..user name and password field should be bland but the user type field should show two values.
Combo Box And Datagrid View Search?
Aug 24, 2009I have a Datagridview with a database attached , but I want to search the the collums by picking the collum I want from a combobox, writing in a textbox and pushing a button and the arrow in the database will move to the row if anything is found, BUT I don't know how to add the collums from the database to the combobox and do the search using the button.
View 3 RepliesVS 2005 Combo Box And Datagrid View?
Aug 31, 2011I would like to implement a code which executes what a user selects from the combobox and display related data from the access database on the datagrid.I have managed to connect to my database.How do I connect the combo box action to display information on the datagrid?elow is a code that am using to read the contents of my table from the database and display it on the datagrid.
cnString = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=C:UsersHomeDocumentsIADCS PROJECTS 2011SAD PROJECT 2011StockControl.mdb"
sqlQRY = "SELECT * FROM Category"
[code].....
Datagrid View Filtering With Dates And Combo?
Apr 10, 2010I am a new one to vb 2005 and I have no idea to get the datagrid filter view option.I developed a new program which have an datagrid view.I want to filter the data based on the 3 thingsthe first one is the "dates between start and end with 2 datetimepicker controlhe Second one is 2 of the filter combo boxes.For ex: it should filter the data between the two datetimepicker
View 4 RepliesAdd Item In Combo?
Jan 9, 2009I'm having some weird trouble with adding a new value in a combobox.The combobox has a datasource which is a bindingsource.The combobox's list is filled from a different table through a different bindingsource. Combobox.valuemember = "ID" and Combobox.displaymember = "Description".When a user types a value in the list, I want to add the new value to the table which is the source for the list. (Which is not the problem, but I don't get that far) The problem is that when the user types a new value in the box, it totally disappears as soon as the user tabs out of the combobox. So, in the event combobox.Validating the combobox.text property (nor any other property) does not show the new typed value.
View 12 RepliesCombo Box Add Item With Tag?
Jun 20, 2012I was wondering if it is possible to combo box with tag on each item? All item tag has a different value.
cb_rate.Items.Clear()
While Reader.Read
cb_rate.Items.Add(Reader.Item("f_type_desc"))
cb_rate.Tag = Reader.Item("f_amount")
End While
Combo Box Item Value
May 20, 2012If I select the first element of a combo box, what will be the index value of this code:index = ComboBox1.SelectedIndex.[code]
View 2 RepliesView Explorer In List View Control?
May 30, 2012how to view explorer in list view control?
View 1 RepliesAdding Combo Boxes To Data Grid View?
Dec 21, 2011Dim ds_Details_all1 As New DataSet
Dim dgv_newtbcolumn As New DataGridViewTextBoxColumn
Dim dgv_newcbocolumn As New DataGridViewComboBoxColumn
Try
If ds_AEGM.Tables(0).Rows.Count <> 0 Then
[Code]...
Combo Box - Assign Value To Each Item?
Dec 20, 2010assign a particular value to each item in a combo box? Or, alternatively, some similar control? Specifically, I want a drop down list to select from a list of countries. I then want to get the ISO 2 letter abbreviation for the selected country. I could have a section of code like this
selected_country = cmb_country.SelectedItem.ToString()
if selected_country = "Afghanistan" Then
country_code = "AF"
ELSE IF selected_country = "Aland Islands" Then
[code]....
but this will get rather tedious.Is there an easier way to do it? I would like to be able to assign a value to each line in the list, like
Afghanistan, AF
Aland Islands, AX
Albania, AL
then get the value for the selected item. Is this possible? If not with a combo box, then any other control?
Combo Box Item Display ?
Jun 5, 2011When insert in the first char then it display the related item the combo box
View 9 RepliesHiding An Item In A Combo Box
Jan 15, 2010I am using VB 2008 Express Edition.
Say I have Combobox1 with items (1)Breakfast (2) Lunch (3)Dinner
and I have combobox2 with items (1)Apples (2)Bananas (3)Grapes(4)Oranges
Now when I choose Breakfast in combobox1, I want user to see all 4 items in combobox2. But when I choose Lunch in combobox1, I only want user to see (1)Bananas(2)Grapes(4)Oranges in combobox2, hiding Apples.
Does anyone know a code where I can hide an item in a combo box depending on the condition?
Using Selected Item In Combo Box?
Mar 11, 2010i need to use the selected item in combo box when user selects for example GREEN from be drop down list after than i need to put that green into the rest of my code, i need to draw a line in green but i dont know how to tell the program to use Green i tried setting up a variable for that, like : Dim rang as string = cmbcolor.selecteditem but it doesn't work
View 7 RepliesVS 2008 Combo Box First Item?
Jul 27, 2009Just a simple question, i have a combo box with the data source defined.The combo box display member it's a number, and i need to display a string in the first position of the combo, something like "Select", or just to show the user that nothing it's selected.It's possible? Or just changing the database column to string?
View 6 RepliesUnable To Open [Design] View
Apr 16, 2009So there I was working on a project. I was putting the finishing touches on the GUI and clicked on the Image list I had added. VB froze up a moment, and when it came back I was on a code view of the form showing the properties I had just set up in the GUI. Suddenly, I can in no way view the form. I get a View code option, but no View designer. If I close out the project and open another, there it is "View Designer" right where I expect it. But in the project I was working on, it is just plain gone.
Is there something I am missing here? Can I recover my project?
If I run it in the debuger the whole form shows perfectly, I just can't get to it to edit it.
Unable To Use The Tree View Loop?
Oct 15, 2011The following code worked with 2.0 Framework, now with NPGSQL 2.0.11 and framework 4.0, this is erroring out despite Pooling=False for the connection. The underlying logic is that add nodes to treeview; for each node added, immediately get subnodes and populate...
vb
Private Sub LoadRequirements(ByVal parnode As TreeNode)
Try
Dim CMd1 As NpgsqlCommand
CMd1 = New NpgsqlCommand
[code]....
Automatically Selecting First Item In Combo Box?
Sep 1, 2009When my application starts, it scans the computers registry for COM ports and adds them in the combo box. The combo box first index is just a blank, and the second is COM1, COM2,...COMn. What I want to do is by default, I want my program to select the first COM port in the combo box, so in this case, COM1.
I know I have to use the PORTNAME property of the serial object, but not sure how I would set that equal to the 2nd index of the combo box.
C# - Refresh A Combo Box Item In-place?
Sep 17, 2009The ComboBox Items collection is an ObjectCollection, so of course you can store anything you want in there, but that means you don't get a Text property like you would with, say, a ListViewItem. The ComboBox displays the items by calling ToString() on each item, or using reflection if the DisplayMember property is set.
My ComboBox is in DropDownList mode. I have a situation where I want to refresh the item text of a single item in the list when it gets selected by the user. The problem is that the ComboBox doesn't re-query for the text at any time besides when it loads up, and I can't figure out how else to do what I want besides removing and re-adding the selected item like so:
PlantComboBoxItem selectedItem = cboPlants.SelectedItem as PlantComboBoxItem;
// ...
cboPlants.BeginUpdate();
int selectedIndex = cboPlants.SelectedIndex;
[Code]....
This code works fine, except for the fact that my SelectedIndex event ends up getting fired twice (once on the original user event, and then again when I re-set the property in this code). In this case, it's not a big deal that the event is fired twice, but it's inefficient, and I hate that. I could rig up a flag so it exits the event the second time, but that's hacking.
