Set SelectedDate RadDatePicker in Edit Form in RadGrid

[Yefta]

Hi, i have a RadDatePicker in EditForm in RadGrid.
The column in RadGrid consist of EditButtonColumn, Name, StartDate, EndDate.
when i click Edit, it shows error:

Sys.WebForms.PageRequestManagerServerErrorException: Specified cast is not valid.

I assume this is because the value StartDate and EndDate is empty/null.

my code to assign the value to RadDatePicker is like this:

<telerik:RadDatePicker ID="radStartDate" runat="server" Culture="en-US" TabIndex="8" Skin="MetroTouch" SelectedDate='<%# Bind("StartDate") %>'>
    <Calendar ID="Calendar1" runat="server">
        <SpecialDays>
            <telerik:RadCalendarDay Repeatable="Today" ItemStyle-BackColor="Yellow">
            </telerik:RadCalendarDay>
        </SpecialDays>
    </Calendar>
    <DateInput DisplayDateFormat="d/M/yyyy" DateFormat="d/M/yyyy" LabelWidth="40%" TabIndex="6">
    </DateInput>
</telerik:RadDatePicker>

<telerik:RadDatePicker ID="radEndDate" runat="server" Culture="en-US" TabIndex="9"  Skin="MetroTouch" SelectedDate='<%# Bind("EndDate") %>' >
    <Calendar ID="Calendar2" runat="server">
        <SpecialDays>
            <telerik:RadCalendarDay Repeatable="Today" ItemStyle-BackColor="Yellow">
            </telerik:RadCalendarDay>
        </SpecialDays>
    </Calendar>
    <DateInput DisplayDateFormat="d/M/yyyy" DateFormat="d/M/yyyy" LabelWidth="40%" TabIndex="6">
    </DateInput>
</telerik:RadDatePicker>

How to set RadDatePicker, when there's no value, shows no error. And if there's a value, the value of StartDate and EndDate will set to TextField and SelectedDate in RadDatePicker 

Thank you very much

[Viktor Tachev]

Hi Yefta,

Note that the SelectedDate property of RadDateTimePicker returns a nullable type. Thus, you should ensure that the corresponding fields accept nullable DateTime values. Moreover, you can check when saving the data if there are no dates entered. If this is the case you can pass a default value to the data source.

Also if the dates are required you can add validation to the grid columns. Thus, the user would not be able to submit the data before entering dates.

Regards,
Viktor Tachev
Telerik