Develop Reference

How can I disable dates prior to the current one in a datedit devexpress?

I have tried to investigate about it but I can't find the solution, I have a dateedit control that has an ID called datebegin so I want in the c# code to be able to indicate that the previous dates be disabled to the current

MinValue will disable(make white space) over all date before of the assigned. This will probably work.
DateEdit1.Properties.MinValue=Now() 'This is a vb.net code

c# DateTimePicker Control Blur on Selected Dates

Does anyone know how to get rid of the annoying blur that takes place when selecting a range of dates on the DateTimePicker Calendar control like in the image below :-
It's far from presentable like this.

Maybe you can get some suitable result playing with the TitleForeColor and TitleBackColor properties. At least you'll be able to see the dates.

Alarm Clock -- Time Picker

I am trying to write a radio alarm clock as a bit of programming practice, I have successfully got a clock working in a line or two. When it comes however to having the use select an alarm time I don't know how to collect the information.
A date time picker can pass a date and time it would seem, but I can only figure out how to select the date which is the part I don't want.
Are there any other objects i can put on a form so a user can select a time to set the alarm?

If you like to manipulate only the Time with a DateTimePicker, the following code should work according to this MSDN article:
timePicker.Format = DateTimePickerFormat.Time;
timePicker.ShowUpDown = true;

How to add a custom display mode to calendar

Is there a way to add a new custom Display Mode to the WPF Calendar control nad how can it be done?
First, I want to describe my problem more in detail.
In my application I need a date (and time) picker in one control to select first a single date and then the time for this date.
The control (as it is) has three display modes which are Decade (showing 12 Years), Month (showing the 12 months of the selected year) and Days (showing the days of the selected month).
What I want to do is, adding another display mode "Hours" which then will show the 24 hours of the selected day.
So there are many problems.
How to add this view?
How to avoid closing the popup after selecting a date? -> it should switch to hours instead and close after selecting the hour
How to add the arrows in the last view to show 12 hours and the halfs on page one of the hours view
How to bind all this to the underlying datetime object which I am interested in at most because it contains what the user selected ;-)
Hope the problem is clear. If there is no direct way to add a view to existing Calendar control than any idea how to solve this would be appreciated.

You could try the Extended WPF toolkit, if you are looking for a out-of-the-box solution. It does not do exactly what you are describing, but it does allow you to select a time in addition to a date.
But if it's not enough, I am pretty sure you will have to make a completely new component. In most cases, a restyling of a component is sufficient to add new features, but in this case, you would most likely have to rewrite it from scratch.
As a workaround, we made a separate hour selection component, which were displayed on the side of the calendar. It's simpler than to rewrite the whole thing anew.

Implementing a multi-state planner

I've been asked to develop a system wherein employees can mark on a form their availability on a given day of the week - for instance an employee could mark themselves as available on a given time on a given week, and unavailable on some other time. It looks a little like this:
http://img697.imageshack.us/img697/842/mvcb.jpg
Currently this works by rendering checkboxes within the table, picking up click events in each cell and marking the checkbox and hence the cell appropriately. I'm using the JQuery "click n drag checkbox" plugin from here. However, I've been informed that there could well be more than two states for a given cell (for instance available, unavailable, available in a given circumstance), in which case binding to a checkboxes checked value isnt going to be a lot of help.
I've never used javascript or asp.net before and am unsure as to the best way to approach this problem. Ideally I could stick a data structure behind each cell which I could update to a certain state and then get my cell colour by binding to this - however I'm at something as a loss as how to best achieve this.

Add a click event to the cell - e.g. click on the cell. Each click could then change the status of the cell. This status could then be store via ajax or using a submit button like on a form. Each cell could relate to a hidden form field which is where you status could be kept.

Maybe take some inspiration from google calendar. There you can select a timespan in the month view by click-dragging a range of days. I guess thats a faster way of entering longer timespans. (Like the lower part of the dragon)