VS 2010 DatagridviewComboBoxColumn Dynamically Populating Items Collection?

Aug 10, 2011

I am trying to create a basic quoting tool but got stuck on how to clear and change the item collection from within a combobox for a datagrid.What we have is a list of 4 columns like a. Device b.TypeofService c.State d.Price Inside a sql database. Data is also structure like above as well.

I have a datagridview where the user will populate a,b,c and the price will be display and a total at the end. However a,b, and c aren't related in my current application. The combobox will show all possible dinstinct values for each column.

This works fine but I want to refine the application to only show the values of b. which are in the database after the user select the value for a. I have tried searching on how to do this as I assume to the Contry/State/City situation but could not find anything for a datagridview control in VB.NET.

Can anyone point me in the right direction? If I cannot do this dynamically from within a datagridview I was thinking of maybe creating three combo box outside and having it populating the datagridview afterwards but it wouldn't be as nice.

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Populating The DataGridViewComboBoxColumn?

Apr 14, 2009

i have a datagridviewcomboboxcolumn that i am trying to populate. i set up the DataSource property using the wizard, there after i selected the DisplayMember from a corresponding drop down of fields from the table set up in the DataSource and then lastly i selected a field to be the ValueMember. problem is when i run my program datagridviewcomboboxcolumn is not populated.there is no drop down at all. what should i do to see my drop down or perhaps i need to set up in code.

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VS 2010 Group A Collection Of Items?

Jun 15, 2012

I am trying to work out a way to group a collection of items like an enum so that I can access them through code else where in my program. i.e I have list of items and sub items


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VS 2010 Items Collection Cannot Be Modified When The DataSource Property Is Set?

Aug 26, 2011

Like i want it to read the lines i have in the text file but i get an error Each time i press the button Why?

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim objreader As New System.IO.StreamReader("C:UsersJamesDesktopMusicas.txt")
Do Until objreader.EndOfStream




Items collection cannot be modified when the DataSource property is set.

Error line



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Accessing And Setitng Items In DataGridViewComboBoxColumn

Feb 11, 2010

I've added a DataGridViewComboBoxColumn to a datagridview and it displays items ok but what I want to do now is have a default item selected, rather than show up empty or as a "Please select" message.


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Add Items In The DatagridViewComboboxColumn Of DatagridView During Runtime

Oct 11, 2011

My application is in VS2008 and coded in VB.net.

I have a datagridView(DGV) on one of my form.DGV contains a column of type DatagridViewComboboxColumn.I have another column of SrNo.

Consider Table1 to be the table from where my DatagridView is filled which contains following fields SrNo,Value1,Value2.

My requirement is i want to fill the values in my DatagridViewComboboxColumn from Table1.The DatagridViewComboboxColumn's combobox should contain values of columns Value1,Value2 of Table1.

Sample data of Table1
SrNo Value1 Value2
1 2 3
2 4 5

As data in datagridView is filled from Table1 the data of SrNo column of Table1 is also populated in one of the column of DGV.

Now my DatagridViewComboboxColumn combobox should contain the values of Value1 and Value2 of Respective SrNo.

Like Row one of my DGV has SrNo 1 as first value,so the Value1 and Value2 of SrNo 1 should be added to the row's DatagridViewComboboxColumn.

Select distinct Value1,Value2 From Table1 where SrNo=DGV.items(0,DGV.currentcell.rowIndex).value.H ope this Query willl make things more clear

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Add Items In The DatagridViewComboboxColumn Of DatagridView During Runtime?

Oct 13, 2011

I have a datagridview with three columns which is filled using Datareader. There is a DatagridViewComboboxcolumn in the datagridView.

I want this DatagridViewComboboxcolumn should also be filled using datareader.

how can i add items to DatagridViewComboboxcolumn using Datareader. Below is the code that i have tried.

Here dr is SqlDatareader

Datagridview.Rows.Add(dr("Column1").ToString, dr("Column2"),dr("DatagridViewComboboxcolumn "))

But when i add this way im getting error on the DatagridViewComboboxcolumn Column.

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C# - DataGridViewComboBoxColumn Very Slow With Lots Of Items?

Sep 28, 2011

I have a DataGrid, with several columns. One of them is DataGridViewComboBoxColumn. I have a lot of items in this column - more than 1000 - and I need all of them. So grouping is not an option - all items must be there, users must be able to select from all.The problem is, DataGridViewComboBoxColumn becomes painfully slow, when number of items is about 1000, and above. This issues is well known to Microsoft, it dates back to Visual Studio 2005: [URL]...The problem is still present in Visual Studio 2010. Any ideas how to solve this?

Is it possible to fill DataGridViewComboBoxColumn with data partially? I mean (that was functionality fully working in Access), when you click DataGridViewComboBoxColumn, some items are displayed (lets say, 100 items). When you scroll down to the latest item, others are loaded (another 100) and so on. I don't see any other option to make DataGridViewComboBoxColumn working faster? Problem is, how to implement this? Has anyone meet that problem before?

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DataGridViewComboBoxColumn Very Slow With Lots Of Items?

Sep 28, 2011

I have a DataGrid, with several columns. One of them is DataGridViewComboBoxColumn. I have a lot of items in this column - more than 1000 - and I need all of them. So grouping is not an option - all items must be there, users must be able to select from all. The problem is, DataGridViewComboBoxColumn becomes painfully slow, when number of items is about 1000, and above. This issues is well known to Microsoft, it dates back to Visual Studio 2005:Is it possible to fill DataGridViewComboBoxColumn with data partially? I mean (that was functionality fully working in Access), when you click DataGridViewComboBoxColumn, some items are displayed (lets say, 100 items). When you scroll down to the latest

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Populating Collection With Arrays?

Sep 10, 2009

Dim A As Collection
Set A = New Collection
Dim Arr2(15, 5)


How can I access the Arr2 through A? For example, I want to do the following:

A.Item(1) (1,1) = 15

so the above would change the first element of the first two-dimensional array inside the collection...

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Dynamically Populating Div In Asp.net?

Aug 9, 2011

I am working on a weboage that will display questions and answers (maybe 5 at one time, maybe 7 at another time) returned from a database table. The questions will each be displayed in a div and the related answers displayed in another div. The question will have an icon "Show Answer / Hide Answer"

How can I go about creating a div and then populating it with values from a table?

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Populating A Listbox Collection Thru An Inputbox

Feb 9, 2009

I am creating a glossary of words used in a study course. I would like to populate listbox with words entered into an imputbox.

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Make A ComboBox Of A DataGridViewComboBoxColumn Accept User New Items?

Sep 19, 2011

Using a DataGridViewComboBoxColumn, the goal is to make the ComboBoxes accept user's new items and also the possibility of choosing items that are already present.I'm aware of using EditingControlShowing event of the DataGridView to change the DropDownStyle of the DataGridViewComboBoxEditingControl at run time to allow this, but I'm wondering if this can be done at a lower level.

What I'm doing now is extending DataGridViewComboBoxColumn, DataGridViewComboBoxCell and DataGridViewComboBoxEditingControl, hoping to change the EditingControl's DropDownStyle in the moment I instantiate it. So far, no luck.The debugger shows the right assignment is being executed, but nonetheless, the DropDownStyle is popping at the EditingControlShowing (using the event for debugging purposes) as DropBoxList, not DropBox, which is the intent.

Here follow the classes:

Public Class DataGridViewComboBoxColumnALT
Inherits System.Windows.Forms.DataGridViewComboBoxColumn
Public Sub New()


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VS 2005 Populating A Collection From Some Tables In The Database?

Apr 26, 2010

I am populating a collection from some tables in the database which serves as a look-up from controls (combobox) I am using but what I want is rather than hitting the database each time can I just cache the collection and get the collection from the cache? The look-up table may or may not change all the time so I would want to have a way to validate if the cached collection is still valid or not.

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Copy Items From ListBox Into The Dropdown Menu Of A DataGridView's DataGridViewComboBoxColumn?

Apr 2, 2011

I have a ListBox1, a Button1 and a DataGridView1 How can I achieve, than everytime I push the Button1, the items from ListBox1 will also reveal in the DataGridViewComboBoxColumn's dropdown menu.... I'm using Visual Studio 2010.

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Accessing And Adding Items To A Collection That Is In A Collection?

Apr 6, 2012

currently in my application I have a Global Collection that is a Collection of Collections.Currently I am trying to add items/ elements to one of the child collections of the Global Collection but I am unable to use the collections methods of the child.When I assign a variable to the child collection and return the collection it is just an object with the collection inside.

Dim GlobalCollection as New Collection
Dim ChildCollection1 as New Collection
Dim tempCurrentCollection[code]......

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C# - Dynamically Populating Column Headers In A Gridview?

Mar 6, 2012

I have a vb.net website with a gridview that currently has exam questions displaying vertically in each row like this:

Name question answer
Joe question1 answer1
Joe question2 answer2


But I would like to change it, so that each question is a header, like this:

Name question1 question2 question3
Joe answer1 answer2 answer3
Jill answer1 answer2 answer3

This makes it more readable since each user is only listed once.I would like to stick with a gridview instead of rewriting all my code.I am actually binding my data to the gridview via some other programmers class. I am using LINQ like this:

Return (From entry In report.FetchAllEntries()
Select questionID = entry.Question.QuestionID,
userID = entry.Session.User.ID,


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Dynamically Creating A Table And Then Populating The Cell?

Jan 25, 2011

Before any jumps in and says, Why dont you just use a gridview, i have my reasons not to use it.I trying to dynamically create a table and then populate the cells via a linq object.

Good news, i can dynamically create the table and the cells.
Dim numrows As Integer = MyActions.Count()
Dim numcells As Integer = 5


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Dynamically Populating CheckBoxList On Databind Event?

Apr 6, 2009

PROBLEM OVERVEIW: everything "runs", it never crashes, it populates the checkboxlist on the page, it even calls BindCheckBoxList during the databind but it never checks the boxes.

I have debugged and stepped through the stop points comments are below.

<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource2"
DataTextField="Abbreviation" DataValueField="Abbreviation" OnDataBinding="BindCheckBoxList" OnSelectedIndexChanged="BindCheckBoxList">


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Dynamically Populating Combobox - Defined Before Runtime?

Jan 19, 2012

I have a large form of 16 rows, and 5 columns of comboboxes. Three rows will be filled with the same information as a list of about 20 items. Two rows contain the same information of only 5 items.


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Asp.net - Dynamically Populating A DropDown Template Control In A Gridview?

May 3, 2012

I have a GRIDVIEW with columns, one of which contains a CSV of possible values for the dropdown that must appear on each row.

Private Sub GridViewParameters_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridViewParameters.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then[code].....

Depending on whether the type of control is a dropdown, textbox, or check box (feined in the table) it hides or shows the relevant control type. If it is a dropdown it needs to get its values from a CSV in a corresponding column. I have a SP that returns a these in table form if passed the id of the relevant row.How do I get that is from the gridview to pass to the drop down and load it correctly?

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How To Create Dynamically Number X Of Collection

Feb 16, 2009

I got a blank, how do I create dynamically a number x of collection?

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VS 2010 DataGridViewComboBoxColumn

Feb 15, 2012

Before I get started let me tell you guys that I have googled and read the documentation from the codebank. Especially jmcilhinney's post. Here is my problem. I have a nicely working datagridview on my form.


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Populating A Font List And Removing Specific Items?

Sep 23, 2009

I've gotten a listbox control to populate with a list of installed fonts, but I need to be able to click a button and remove the selected item from the listbox. How do I do this? Every time I try, an exception is thrown.

Here is the code:

Public Class Form1
Dim fonts as New Drawing.Text.InstalledFontCollection
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load


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VS 2010 DataGridViewComboBoxColumn In A Datagridview

Jul 20, 2010

I am having trouble with a comboboxcolumn in a datagridview. I have a MySQL table with "products" which i have managed to populate the combobox with, but i would like it so when a user picks a product from the combo list, the rest of the fields in that row are populated with the product information, price etc.

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VS 2010 DataGridViewComboBoxColumn In DataGridView

Feb 18, 2011

I have a DataGridViewComboBoxColumn in my DataGridView. I want to programatically drop down the list box so that the items arte displayed. With a normal combo box this is done with ComboBox1.DroppedDown = True. The problem is that the DataGridViewComboBoxColumn doesn't have the attribute DroppedDown.


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Place Dynamically Generated Objects In An Array (or Collection)?

Apr 11, 2011

I created a custom class for a custom object. I instantiate like so[code]...

Now, I have two problems. First, right now this is just overwriting the same object properties, again, and again. I need to somehow dynamically name the object. Then, I need to place these objects in an array so I can iterate through them...

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Listbox Items Colour - Two Types Of Items Populating In A Listbox (checked Listbox)

Apr 28, 2009

I am using VB.NET (version 2008). I have two types of items populating in a listbox (checked listbox). For example: lets say one is type "A" and other is "Type B". Their names maybe same so if the user sees those items in listbox then he won;t be able to determine their type until he click on them and checks out its properties. I wanted that I add each item to listbox and colour them so that blue for example means type "A" is there and red means the other. So this way I will be able to know at a glance that how many item of what type is present. I guess it may not be possible to do that in a standard checkedlistbox. I am also using component factory's krypton controls which enhance the gui of an application. But I dunno if I can progress using that.

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VS 2010 Event Handling On DataGridViewComboboxColumn?

Jun 20, 2012

I'm trying to manipulate the events of the dataGridViewComboboxColumn in order to execute an SQL statement based on the value change of the cell (IndexChanged) and update the database table. Either this or how can i update several rows in a table from a datagridview ? if you check my previous posts you'll understand the whole story behind this question and to which grid i'm refering to.

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.net - Can't Enumerate Through Items In Collection?

Apr 13, 2011

Aren't arrays of object enumerable?Look for the comments in the code

Public Class AddressCollection
Inherits System.Collections.ObjectModel.Collection(Of AddressType)
Public Sub New()
End Sub


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