How to clear items from a listbox

I tried this.  The items remained visible.

How do I refresh the listbox display?

This is for asp.net ?

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

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));

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;

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.

sorry meant DataSource :

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

lstFilesSent.Items.Clear();
            lstFilesToDo.Items.Clear();

Works now.  I rebuilt the solution in VS 2012.

Thanks,

Thank you.