How to Sync Progressbar with ListBox Items Removal c#

Question

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I m making a project in which i got a listBox1 a timer1 a button1 and a progressBar1.

When i click button1 the timer1 starts.

C#

private void button1_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            timer1.Interval = 500;
            progressBar1.Maximum = listBox1.Items.Count;
            progressBar1.Value = 0;
        }

When timer1 ticks it removes one item from listBox1 and progressBar1 must show the progress of Removal.

C#

private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            if (listBox1.Items.Count > 0)
            {
                
                listBox1.Items.RemoveAt(0);
                progressBar1.Increment(1);
                groupBox1.Text = listBox1.Items.Count.ToString();
            }
            if (listBox1.Items.Count > 0)
            {
                timer1.Enabled = true;
                progressBar1.Maximum = listBox1.Items.Count;
                progressBar1.Value = 0;
            }
        }

But i think the above code got some bug with progressBar1 as it dont show progress while removal of items and it is full when the listBox1 items = 0.

Posted 14-Jun-14 21:13pm

Member 10579673

Add a Solution

3 solutions

Solution 1

Try This

C#

private void timer1_Tick(object sender, EventArgs e)
               {
                  if (listBox1.Items.Count > 0)
                  {
                     listBox1.Items.RemoveAt(0);
                     progressBar1.Increment(1);
                     groupBox1.Text = listBox1.Items.Count.ToString();
                  }
               }

Posted 15-Jun-14 0:26am

Member 2303544

Comments

Member 10579673 15-Jun-14 7:31am

Not working

Member 2303544 15-Jun-14 10:43am

private void timer1_Tick(object sender, EventArgs e)
{
if (listBox1.Items.Count > 0)
{
listBox1.Items.RemoveAt(0);
progressBar1.Increment(1);
progressBar1.Value = 0;
groupBox1.Text = listBox1.Items.Count.ToString();
}
else
{
timer1.Enabled = false;
}
}

Solution 3

C#

private void timer1_Tick(object sender, EventArgs e)
{
  if (listBox1.Items.Count > 0)
  {
    listBox1.Items.RemoveAt(0);
    progressBar1.Increment(1);
    progressBar1.Value = 0;
    groupBox1.Text = listBox1.Items.Count.ToString();
  }
  else
  {
    timer1.Enabled = false;
  }
}

Posted 15-Jun-14 4:45am

Member 2303544

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Debabrata_Das · Accepted Answer · 2014-06-15T04:23:00

Hello friend, the progress bar is showing full when the listBox1 items = 0 because of the following code:

C#

progressBar1.Maximum = listBox1.Items.Count;
progressBar1.Value = 0;

Here you're setting Maximum property as 0 and the next line you're setting Value as 0 which means progress is 100% complete hence showing full.

Now try the following code changes:

C#

private void timer1_Tick(object sender, EventArgs e)
{
    if (listBox1.Items.Count > 0)
    {
        listBox1.Items.RemoveAt(0);
        progressBar1.Increment(1);
        groupBox1.Text = listBox1.Items.Count.ToString();
    }
    else
    {
        timer1.Enabled = false;
    }
}

- DD