How to clear data from list view in c#

I have a button "Show data". When click it, data will display in list view. But I want to clear it and then click "Show data" again to display new data. Because I don't want when I click "Show data" again It duplicated data. So I want to clear old data to show new data (no duplicated data). But its header no clear (still keep header). What is the source code?

One more question. I want to show data from table in access to Datagridview in c#开发者_StackOverflow (eg. table in access contain: Name, Position, salary and Datagridview in c# has 3 column also: Name, Position and Salary by click on button "Show". What is the source code?

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In WinForms:

listView1.Clear();

In WPF:

listView1.Items.Clear();

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for listView on clicking first clear the list and then add items: like below

    private void button9_Click(object sender, EventArgs e)
    {
        listView1.Clear();
        listView1.Items.Add("Item1");
        listView1.Items.Add("Item2");
        listView1.Items.Add("Item3");
        listView1.Items.Add("Item4");
        listView1.Items.Add("Item5");
    }

for your second question try below link:

How to show data from Access on C#?

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What about the following?

ListView lv = new ListView();
while (lv.Items.Count > 1) {
    //leave the header
    lv.Items.RemoveAt(1);
}

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While making windows store app write:

listview.Items.Clear();

Just listview.Clear(); won't work in windows store app

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listView1.Items.Clear();

Clears in 2008 c# column headers with the data, if you have multiple ListView on the same form the best way is writing a method such as (suggested by Lasse as above)

private void ClearLvItems(ListView li)
{
   while(li.Items.Count>1)
      li.Items.RemoveAt(1); 
}

Or if it does not work as expected as it does not work with me (one row still rests in Listview)

 listView1.Items.Clear();
 SetHeaders(li); // If you have more then one ListView in the same form. Otherwise don't use the parameters.

 private void SetHeader(ListView li)
 {
   string[] header_names = new string[] {"Id","Name","SurName","Birth Date"};
    int i = 0;
    foreach (ColumnHeader ch in li.Columns) 
    {
        ch.Text = header_names[i];
        ++i;
    }
 }

Another discussion is Here

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ListView.Clear Method removes all items and columns from the control.

The following are some articles that may help you working with ListView and DataGridView controls:

ListView @ C# Online.Net

Working with Data—Using the DataGridView

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    foreach (ListView item in listview.Items)
    {
        ListView.Items.Remove(item);
    }

or

    ListView.Clear();

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put this at the top of your "Show Data" button's click event.

private void showData_Click(object sender, EventArgs e)  // done
        {
             listViewData.Items.Clear();
             // your code
        }