How to prompt user on a DateTimePicker ?

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There's a known way to check for empty textboxes like these

 Sub Check_Textbox()
        Dim r As DialogResult
        If txtStaffID.Text = ""
Then

            r = MessageBox.Show("Please try again.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning)

But is there a way to prompt the user on a DateTimepicker? here is what and how i want the system to prompt the user:

The DateTimePicker checks the date. If it's not 3 days in advance, it will prompt the user and disallow any action.

Is the above action possible? If so, can i know the codings to it? Thanks in advance.

Posted 18-Jul-12 15:25pm

Rickysay

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Abhinav S · Accepted Answer · 2012-07-18T17:32:00

Solution 2

You can consider using the DateTimePicker ValueChanged event[^].
Handle this event, read the date value (from the event's parameters) and if the data does not meet the condition, display a message box similar to the way you were doing this for the textbox.

Posted 18-Jul-12 17:32pm

Abhinav S

Comments

Rickysay 19-Jul-12 4:28am

Private Sub dtpFrom_ValueChanged(ByVal sender As Object, ByVal e As EventArgs) Handles dtpFrom.ValueChanged
Dim advance As TimeSpan
Dim date1 As Date
Dim date2 As Date

date1 = Convert.ToDateTime(dtpFrom.Value)
date2 = Convert.ToDateTime(dtpFrom.Value)
advance = date2.Subtract(date1)

DateTime.Now
If dtpFrom.Value <= 3 Then
MessageBox.Show("You need to request 3 days in advance. Please Try Again.")
End If
End Sub

How do i subtract the current date to the selected date? I've tried for hours and still clueless

Simon_Whale 23-Jul-12 18:22pm

dim thisdate as DateTime = new DateTime(2012,03,24)
dim days as double = DateTime.Now.Subtract(thisdate).TotalDays

if days <= 3 then
'do what is need here
end if

Christian Graus · Accepted Answer · 2012-07-18T15:31:00

Solution 1

Yes, you need to write code that checks the date in your datetime picker. If you subtract one date time from another, using DateTime.Now, you get a Timespan. If the difference in days < 3, then you show your message.

Posted 18-Jul-12 15:31pm

Christian Graus

Comments

Rickysay 18-Jul-12 21:32pm

Can you give a coding sample?

Christian Graus 18-Jul-12 21:34pm

No. I don't do VB at all, and if you can't even attempt it, then I'm not sure what you're doing. You know how to get the date time value to work with it, right ? You know how to subtract one value from another in code ? If this was C#, I might attempt to give a sample, even though I disapprove of people who don't learn to program because they use sites like this to get 'code samples' that they can't understand, but I feel certain if I wrote this in C#, you'd have no clue what to do with it.