Develop Reference

WPF - what is the best way to bind data from a database to a checkbox control

I am struggling some time with checkbox control in WPF. What I am trying is to to make some kind of filter.
1. So first I need to fill the checkbox control with the database items
2. Second I need to check if anything is checked
3. Third if anything is checked I want to take those values and use them to search through the database
4. Should I use only checkbox control for this or should I put it in some container or a listBox?
I have find many topics here that are mentioning this stuff, but I couldn't manage to find the complete answer, only lot of parts that are not compatible with each other. I would really appreciate if someone explain to me how checkbox in WPF works.

If you have multiple values and you want to display multiple CheckBoxes, one for each of them, then you will need to use a ListBox and have the TemplateItem a CheckBox. This way your collection of items is bound to the ListBox, and for each item in the ListBox a CheckBox is shown.
So to get each of the values after there is an additional step if your doing MVVM and don't want to touch the UI. What you do is create a wrapper class that sits around your class and has a extra property for the IsChecked data. This way you can get the checked state without touching the UI.
I have an example of this on my blog:
Checked ListBox in WPF
To check which items are checked you just need a simple LINQ query. So if you use the example there from my blog then you should be able to do something like this:
var checkedCustomers = Customers.Where(w=>w.IsChecked).ToList();

Winforms UI Dynamically Displaying Parts

I came across a tutorial and some example code for an audio converter. You select the format you want to convert to from a drop down, and when you do all sorts of options appear in a previously blank area, different options based on the format you choose. It's called Audio Converter .NET and is from same author as Audio CD Ripper .NET. I can't find the tutorial, but here is a screenshot.
See how on the right there is extra controls that are not on the left. I was experimenting trying to add another category. I added it to the dropdown, but am unsure how to make it so certain fields come up when it is selected.
I understand that they create those controls for those items, but I don't see how they call the correct one when the combo box selects something. I see controls are created, but if I try to duplicate the controls into another entry in the combo box they don't show up for either the new or old one I was duplicating from.
What's the best way to go about achieving something like this?
Thanks

The easiest way is to create the controls needed for every option in the dropdown inside a panel, and simply turn it's visibility property from false to true whenever it's corresponding option is selected using the combobox's SelectedIndexChanged event handler. (And don't forget to turn the current visible panel's visibility to false)

C# Combobox to show different lists

I'm a bit stuck on the approach for this task. I want to be able to provide 2 separate lists for one combobox based on a radio button selection.
I'm not looking for the exact code, but rather the approach.
Do I create two lists and make them visible/invisilble based on radio button selection
Do I create 2 arrays and based on radio button selection populate combobox items
Another implementation?
Without showing me the code, what approach would be seen as standard?
Thanks!

The recommended solution is to create 2 arrays and based on the user selection (radio button) populate the list with the appropriate data/items.

How to store ids with selections in AutoComplete AjaxControlToolkit ASP.NET?

I am implementing the Autocomplete textbox from AjaxControlToolkit in ASP.NET. The ServiceMethod allows me to call a function which will populate a string list with which to populate the autocomplete list that will display.
My question is, when I call the database, I would like to store an ID that corresponds with each selection, so that once it is selected by the user, I can easily look it back up in the database. I don't want to display it in parentheses next to the selection (ie. "John Smith (ID1234)", etc.)
Is there a way to do this so that the ID is 'hidden' so to speak within the Autocomplete box, and can be retrieved on selection? Should i use a different autocomplete box to accomplish this? Any help is greatly appreciated. Thanks!

This might answer your question
http://www.aspsnippets.com/Articles/Fetch-multiple-values-as-Key-Value-pair-in-ASP.Net-AJAX-AutoCompleteExtender.aspx

asp.net: combobox or listbox PLUS checkbox

i need a solution like this:
http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/checkboxes/defaultcs.aspx
however, i need the user to be able to add entries in here.
does such a control already exist?
it can be either jquery or asp.net
it also does not have to be a combobox, it can be a listbox. i need to have every item have a checkbox next to it and be able to add a comment for each entry.

Take a look at the ASPxGridLookup control from the DevExpress component vendor.
The ASPxGridLookup component allows the implementation of the multi-select DropDown functionality:
http://demos.devexpress.com/ASPxGridViewDemos/ASPxGridLookup/MultiSelect.aspx
http://www.devexpress.com/example=E3467
http://codecentral.devexpress.com/E3467/
with editing capabilities via the embedded ASPxGridView object:
http://demos.devexpress.com/ASPxGridViewDemos/GridEditing/EditModes.aspx

Ref : DropdownList with Multi select option?
Multiple dropdownlist with checkbox....checkout below link...
checkout demo page here...
http://download.ysatech.com/ASP-NET-Multiple-Selection-DropDownList/ASP-NET-Multiple-Selection-DropDownList.aspx
Blog page here....
http://blog.ysatech.com/post/2009/09/09/ASP-NET-Multiple-Selection-DropDownList-with-AJAX-HoverMenuExtender.aspx
http://www.codeproject.com/KB/user-controls/MultiSelectDropdownList.aspx

To me it sounds like it might be better for you to run with a ListBox. Telerik offers the RadListBox, which allows you to have checkboxes as seen here.
Additionally, you could allow for edits upon, for example, double-click as is displayed in the source code attached to this forum post.
Finally, if you want to also display the comments then you could use an ItemTemplate to define a custom layout for each RadListBoxItem and allow the user to edit both the main and comment fields.
That should cover everything that you need.