Windows forms listview controls not working while cilck event

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Hi,

I am using Windows Forms ListView Controls (ListView1 and ListView2).

pls. refer the screenshot for details.

When I click the button1, then the corresponding list1 selected item will transfer to Listview2.

for example, the first time I selected A, B, C and then click Button1. now the item will move to Listview2 control.

if I select the same item (A, B, C) again then click Button1, now and then the item should not come again in ListView2 controls.

the main concern is, to prevent the duplicate values in listview2.

Refer attached: Listview ScreenShot.jpg

PS: Pls. guide us how to prevent the duplicate values when I try to move the same values in listview2.

What I have tried:

private void Button1_Click(object sender, EventArgs e)
        {
            foreach (ListViewItem item in Listview1.SelectedItems)
            {
                if (item.Text  != null)
                {
                    Listview2.Items.Add(item.Text);
                }
            }
        }

Posted 20-Feb-18 2:11am

gani7787

Updated 20-Feb-18 2:42am

v2

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RickZeeland · Accepted Answer · 2018-02-20T02:43:00

You can do it like this:

foreach (ListViewItem item in listView1.SelectedItems)
{
    if (item.Text != null && !listView2.Items.ContainsKey(item.Text))
    {
        listView2.Items.Add(item.Text, item.Text, null);
    }
}

To remove items from listview2:

foreach (ListViewItem item in listView2.Items)
{
    if (listView2.SelectedItems.Contains(item))
    {
        listView2.Items.Remove(item);
    }
}