Solved

How to clear items from a listbox

Posted on 2013-11-29
9
318 Views
Last Modified: 2013-11-29
I have populated a listbox named MyListBox.

How do I clear all the items from MyListBox?

Thanks,
0
Comment
Question by:Dovberman
  • 5
  • 4
9 Comments
 
LVL 29

Accepted Solution

by:
Paul Jackson earned 300 total points
ID: 39686011
mylistbox.items.clear()
0
 

Author Comment

by:Dovberman
ID: 39686019
I tried this.  The items remained visible.

How do I refresh the listbox display?
0
 
LVL 29

Expert Comment

by:Paul Jackson
ID: 39686037
This is for asp.net ?

Please post some code and explain how you are populating the listbox and trying to clear it
0
 

Author Comment

by:Dovberman
ID: 39686069
Yes, this is for asp.net 4.0.

        var arrFiles = (from file in System.IO.Directory.GetFiles(strSourcePath, "*.txt")
                            orderby System.IO.Path.GetFileNameWithoutExtension(file) ascending
                            select new
                            {
                                FileName = System.IO.Path.GetFileNameWithoutExtension(file),
                                FullPath = file
                            }).ToArray();

            // Load listbox from array

            for (int i = 0; i < arrFiles.Count(); ++i)
            {
                lstFilesToDo.Items.Add(arrFiles(i)FileName);
            }

            int intTotal = arrFiles.Count();
            lstFilesToDo.DataSource = arrFiles;

// This is done by clicking a different button.
// Clear the listbox

            lstFilesToDo.Items.Clear();
     

            lblStatus.Text = "Daily Update Done for " + lblAvailableSource.Text;
            cmdFilesToDo.Focus();

// I could try a for loop for the Count property

int intSentCount = lstFilesSent.Items.Count;
for intCtr =0 to intSentCount

lstFilesSent.Items.Remove(lstFilesSent.Items(intCtr));
0
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 29

Expert Comment

by:Paul Jackson
ID: 39686124
What event are you doing the population of the listbox in, if you are doing it in the page_load you need to check for if (!Page.IsPostback) before executing the code to stop it getting populated again when you click the button to clear the listbox.
If this is not the case then try setting the source property to null :

 lstFilesToDo.Items.Clear();
lstFilesToDo.Source = null;
0
 

Author Comment

by:Dovberman
ID: 39686144
protected void cmdFilesToDo_Click(object sender, EventArgs e)

        {
          // Load listbox from array

            for (int i = 0; i < arrFiles.Count(); ++i)
            {
                lstFilesToDo.Items.Add(arrFiles(I)FileName);
            }
lstFilesToDo.Source = null;  
Error: Source is not a listbox property.
0
 
LVL 29

Expert Comment

by:Paul Jackson
ID: 39686150
sorry meant DataSource :

 lstFilesToDo.Items.Clear();
lstFilesToDo.DataSource = null;
0
 

Author Comment

by:Dovberman
ID: 39686167
lstFilesSent.Items.Clear();
            lstFilesToDo.Items.Clear();

Works now.  I rebuilt the solution in VS 2012.

Thanks,
0
 

Author Closing Comment

by:Dovberman
ID: 39686169
Thank you.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Problem Hi all,    While many today have fast Internet connection, there are many still who do not, or are connecting through devices with a slower connect, so light web pages and fast load times are still popular.    If your ASP.NET page …
A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

912 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

24 Experts available now in Live!

Get 1:1 Help Now