473,396 Members | 1,921 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,396 software developers and data experts.

Combobox: How do I allow the selection to be cleared?

12
I am creating a windows form application in VB.NET 2.0. I have a datagridview, and one of the columns ("SelectorColumn") is a Combobox. The combobox values come from a dataset, and the column is bound to a table that allows NULL values. I want users to either select a value from the list, or leave it blank.

When I open the form with the datagridview, none of the comboboxes in the SelectorColumn have any selections. I can select one of the values, and everything works fine. HOWEVER, once I have made a selection, I cannot clear the selection.

How can I add the ability to clear a selection so that the underlying value would be null? Is this possible to do when binding the combobox to a datasource that does not contain null values?

Much thanks!
May 4 '07 #1
0 1102

Sign in to post your reply or Sign up for a free account.

Similar topics

1
by: Steve | last post by:
I have a continuous form with several unbound comboboxes in the form header. The comboboxes are used to provide criteria for the SQL of the form. The code behind the form looks like: Public Sub...
5
by: Steve | last post by:
I have an unbound combobox in the form header of a continuous form. The selection in the combobox sets the where clause in a querydef which determines QryPFrmInventoryManagement. The following code...
2
by: ross kerr | last post by:
Hi all, I have a control that extends the ComboBox object. It updates the selected item based on what the user enters in the text area. In the OnLeave event of the combobox, the selected...
0
by: Alex K. | last post by:
Hi all I noticed that if I link a combobox to data table (setting DataSource property), then it is very hard to clear selection by setting SelectedIndex = -1. I have to set SelectedIndex = -1...
8
by: Steve B. | last post by:
My Program: a local C# ADO.Net application using VS 2003 Right now I have about 5 ComboBox's which provides drop down selection entries from the same MS-Access table via a DataConnection,...
6
by: Doug Bell | last post by:
Hi I have a datagrid with a combo box, I need to populate the combo with data dependant on the record value. eg for record 1, field Warehouse = 2R so combo would allow selection of locations...
19
by: Bernie Yaeger | last post by:
Everyone misses the point on this - what we need is a combobox autocomplete that is a dropdownlist only. When in dropdown mode, you can enter text - making that autocomplete is trivial. But when...
0
by: Bob | last post by:
Its often necessary to allow the user to remove a selection from a combox. In my case, most are bound to lookup tables. I suppose I could, in each lookup table create an empty record and have in...
4
by: WhiteWizard | last post by:
Alright everyone, I've managed to stump this group 2 or 3 times now. Don't let me down on this one ;) I have a combo box that lists a number of tests to be run. The user would like the option...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
0
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.