Problem with updating already stored remaining time, with new current time

Question

0.00/5 (No votes)

See more:

, +

Hi, I have a little issues, while auto-refresh all values (remaing time), in summary the program pick the datatime stored in a combobox then subtract it with current time (datetime.now) and return the value (remaining time) stored in another one combobox. The issues is that when I click the refresh button only the last item on the remaining time combobox will change. I need that it will change from the first and so on till the last, using the previously stored datatimes in the combobox.

What I have tried:

Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        For i = 0 To ComboBox3.Items.Count - 1
            ComboBox3.SelectedIndex = i
            Dim d As DateTime = DateTime.Now
            Dim parsedate As DateTime = ComboBox2.SelectedItem.ToString
            Dim d2 As DateTime = DateTime.ParseExact(parsedate, "dd/MM/yyyy HH:mm:ss", System.Globalization.CultureInfo.CurrentCulture)
            Dim dysdiff As Integer = (d - d2).Days
            ComboBox3.Items(i) = (365 - dysdiff).ToString + " Days"
        Next

    End Sub

Posted 16-Jan-22 12:25pm

MXwell8

Updated 16-Jan-22 14:37pm

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Luc Pattyn · Accepted Answer · 2022-01-16T14:37:00

Solution 1

Hi,

your

ComboBox3.SelectedIndex = i

is not doing anything useful.

Your

Dim parsedate As DateTime = ComboBox2.SelectedItem.ToString

will give the same result on each iteration of your loop, and all items in ComboBox3 will end up showing the same number of days, which depends on which ComboBox2 item was selected when you clicked the button.

So my guess is you wanted the former to be

ComboBox2.SelectedIndex = i

That would result in varying strings in ComboBox3.

But then I'm puzzled why you are using SelectedIndex and SelectedItem at all. A simple

Dim parsedate As DateTime = ComboBox2.Items[i].ToString

should suffice.

:)

Posted 16-Jan-22 14:37pm

Luc Pattyn

Comments

MXwell8 17-Jan-22 14:10pm

Hi, thank you for the answer, it's possible to do this on a form laod without selection an item from combobox? Like only a refresh of all the values?
Also when I put
Dim parsedate As DateTime = ComboBox2.Items[i].ToString
it's say to me that it's not possible to convert combobox object collection in date. It's there a difference between [i] and (i) ?

Luc Pattyn 17-Jan-22 14:25pm

Sorry,
(1) I copied one line of yours without noticing it contained a bug (wrong type!); should be
Dim parsedate As String = ComboBox2.SelectedItem.ToString
(2) yes VB uses parentheses, my mistake, I'm used to C# and brackets, so
Dim parsedate As String = ComboBox2.Items(i).ToString

MXwell8 17-Jan-22 15:51pm

Thanks again for the help :)

Luc Pattyn 17-Jan-22 15:58pm

you're welcome