I have a view that get a date from the user by datetimepicker as you can see here :
After clicking on the submit button the value is changed
Note:the type of DateOfLoanGet is a datetime.
So why this problem is happened ?
Best regards.
You can choose one of the formatting options. Since it seems you want some custom format, I'd check custom formatting.
dateTimePicker.Format = System.Windows.Forms.DateTimePickerFormat.Custom;
dateTimePicker.CustomFormat = "yyyy-MM-dd HH:mm";
I have a form with two data-bound text boxes, one data-bound DateTimePicker and a BindingNavigator. I bind these components at run-time to the relevant data sources (the 'Text' and 'Value' of the Text Boxes and DateTimePicker respectfully are bound the relevant fields in a data set). All the components display the present records correctly. Normally, when one clicks the "Add New Item" button on the navigator, all the Text Boxes will clear in preparation for the new entry. However, I have the problem that this does not occur when the DateTimePicker is bound, and furthermore any attempts to update the datasets do not occur correctly. If I neglect to bind the DateTimePicker then all works as expected. What is the cause of this behaviour and is there a way around it?
The DateTimePicker doesn't support binding to nullable data. When you add a new row, the value for that field will be DBNull.Value by default and that cannot be converted successfully to a value that can be assigned to the Value property of the DateTimePicker, which is type DateTime. You need to either extend the DateTimePicker and add a new property that supports both DateTime values and DBNull objects and bind that or else set the DefaultValue property of your DataColumn so that there will always be a DateTime to display in the DateTimePicker.
This problem was resolved for my scenario by simply controlling the addrow method of the binding source based on this site: http://www.vbforums.com/showthread.php?645401-RESOLVED-datetimepicker-with-binding-source
Add a new button on the binding navigator (to use as your 'Add') and remove the old one.
Connect to the click event and set the datetime of the new row being added:
DataRowView row = (DataRowView)bs_.AddNew();
row["dbDateTime"] = DateTime.Now;
where dbDateTime is your database field.
Although you may have to add some more code to the click event, such as moving to the newly added row on the datagrid, this option was by far the easiest to implement.
Im writing a hotel booking system with VS2012 which uses ms sql and in the booking i have two datetimepicker controls. When i select a date in the first one the date automatically gets transfered to the second datetimepicker. I now want when the user opens up the second datetimepicker not being able to select a date that is before the first date from the first datetimepicker. I dont want to use if method displaying a message i just want the dates to be "greyed" out.
Is that possible and how?
*edit (screenshot of how i would like it to be viewed or similar http://i43.tinypic.com/2zpimvs.jpg )
*edit2: its not the control(dateTimePicker2) it self i want to grey out, its the dates inside it that is smaller then the date selected in dateTimePicker1. The screenshot provided is in the area of what im looking for.
You could try this:
DateTimePicker2.MinValue = Convert.toDateTime(DateTimePicker1.SelectedDate);
EDIT
Standard controls don't support the grey-out of a datetimepicker. If you want to do this, you need to subclass the datetimepicker or look at a premade control like a DateEdit from devexpress (i think they even have free controls).
Change the second datepicker MinDate to first DatePicker selected date .. like below ..
rdpDatePicker2.MinDate = rdpDatePicker1.SelectedDate.Value;
Situation: A C# Windows Forms application with a TextBox and a ComboBox. AutoValidate is set to EnableAllowFocusChange.
The TextBox represents and is shown as a percentage value e.g. "10 %" which is stored as an int. Both input controls are data bound, the TextBox with a parsing and formatting ConvertEventHandler as well as a Validating CancelEventHandler.
When entering an invalid input like "abc" and leaving the control: My Validation is performed and fails (e.Cancel = true, ErrorProvider ..). And my parsing fails (e.Value stays "abc").
Problem: When I now change the value of the ComboBox and leave it (lost focus/perform validation) or do a ValidateChildren, my format function is called with the last valid percentage value and the wrong input is lost.
Stacktrace: The problem is triggered by a ReportPropertyChanged of the ComboBox and leads to Binding.PushData, FormatObject and OnFormat -> Which calls my format function with the original value.
I want my TextBox to stay invalid and no magical reset. What can I do to prevent a value reset? Or what did I do wrong?
Thanks!
I am implementing search functionality in WinForms and I search by date range. Thus there are dateForm and dateTo date pickers on the form. By default their values are date time now() and if user do not touch date time pickers at all he will not get any results. Because search will be performed between now() and now(), also if I put min and max values as default it would solve first problem but there would be another problem if user wants to search by date range, he would need to click many times to come from default 1700 (something) to now()
Any suggestions to solve this problem?
Thanks a lot.
You can't have a valueless datepicker with the out-of-the-box control. Why? It is backed by DateTime, which is non-nullable.
You can disable it with another control, or leave it disabled until the user clicks (bad UX for keyboard enthusiasts, like myself), or find or create (!) one that uses Nullable<DateTime>.
Edit:
In response to your comment, yes, you can do this; in fact, I've done it.
use fields or private properties to hold the 'from' and 'to' dates, instead of reading them from the dtp, and set their defaults to min and max
use a boolean flag to indicate when you are manipulating the dtp value in code, and in the dtp's ValueChanged event, set the flag's value to false
in the form load event, set the flag to true and dtp value to today's date
also in the ValueChanged event, set the from and to fields to the values of the dtps (you have to set both when either dtp changes, because the user will see the other one as set to today, but the search value will still be min or max).
The problems with this is that once the user has changed the date selection, she can't easily go back to "all dates." Furthermore, the user can't select "today only" without first changing one of the dates and then changing it back.
I think the best solution for you is to have a checkbox, "search by date range," which either enables the two dtps that are otherwise disabled, or displays the dtps that are otherwise hidden. Then you search from min to max unless the checkbox is checked, and when the checkbox is checked, you use the two dtp dates no matter what they are. Don't forget to deal with to and from being out of order, which can be done in several ways.
Have a look here for a nullable datetimepicker on CodeProject, in fact there are a few here.
Put a check box next to each datetime picker, and use the check box to enable/disable the datetime picker.
So if the datetimepicker is disabled, you know the user do not want to specify the datetime.
You can set DateDateTimePicker.Format property to Custom.
Then set DateDateTimePicker.CustomFormat property to your default text (e.g "N/A" or a space " ")
After the user has selected a certain date value, you should set back the format property to short etc.
Hope this helps!
The DateTimePicker has a ShowCheckBox property that "Determines whether a check box is displayed in the control. When the box is unchecked, no value is selected."
I've used something like the following for date range selectors that can be empty. One user told me that at first, she didn't know what the check box was for, but she figured it out on her own after using it a couple of times.
public DateTime? EndDate
{
get
{
DateTime? returnValue = null;
if (endDateDateTimePicker.Checked)
{
returnValue = endDateDateTimePicker.Value;
}
return returnValue;
}
set
{
if (value.HasValue)
{
endDateDateTimePicker.Checked = true;
endDateDateTimePicker.Value = value.Value;
}
else
{
endDateDateTimePicker.Checked = false;
}
}
}