How to check duplication in listbox?

I have the code which i used to check duplication in listbox but not working?

Q. I have 3 columns in listview grid and i want to check duplication with only one field. How to do that?

Code:

if(listView1.Items.Contains(lvi) == false)
{
//Add the item to the ListView Control
listView1.Items.Add(lvi);
}
else
{
//Warn user of duplicate entry...
MessageBox.Show("Duplicate Item!");
}

Thanks, Please help

 

What would be the best way then? Can you give me the loopong condition here please?
e.g.
foreach(lvt.SubItems in scheduleListView.Items)
//This above give me error "Type and identifier are both required in a foreach statement"

 

What you mean?

 

Can you write sample of code please?

 

This below code doesnt work

foreach(string itemtext in scheduleListView.Items) // change it to subitems or as needed??

The main issue is first of all you have to check if the list is null if it is null then just insert the new item when you try to insert item again it will check for duplication. how would you implement that?

Just help me small bit in looping condition. Thanks Shabbir

 

It worked. Thanks added new function to check the duplication

Code:

private bool IsInCollection(ListViewItem lvi)
        {
            foreach (ListViewItem item in scheduleListView.Items)
            {
                bool subItemEqualFlag = true;
                for (int i = 0; i < item.SubItems.Count; i++)
                {
                    string sub1 = item.SubItems[i].Text;
                    string sub2 = lvi.SubItems[i].Text;
                    if (sub1 != sub2)
                    {
                        subItemEqualFlag = false;
                    }
                }
                if (subItemEqualFlag)
                    return true;
            }

            return false;

        }