WPF - Operation is not valid while ItemsSource is in use.

On wpf combobox DropdownClosed, I want to bind ListView.

private void cmbAction_DropDownClosed(object serder, EventArgs e)
{
int UserID = 26;
string Actions = cmbAction.SelectedValue.ToString();
var data = service.PostLogDetails(UserID);
if (Actions == "Login")
{
var listItems = (from A in data orderby A.FirstName select new { Action = "Login", AccessDate = A.LogInTime });
listView1.Items.Clear();
listView1.ItemsSource = listItems;
}
else if (Actions == "Logout")
{
var listItems = (from A in data orderby A.FirstName select new { Action = "LogOut", AccessDate = A.LogOutTime });
listView1.Items.Clear();
listView1.ItemsSource = listItems;
}
}

After using this code, showing error.

"Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead."

How can I solve this?

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