void RefreshWorkITems()
{
//dataGridView1.DataSource = workItemService.GetAll();
//dataGridView1.Refresh();
//clearing items in the list
listBox1.Items.Clear();
listBox2.Items.Clear();
listBox3.Items.Clear();
//fetching all work items
var data = workItemService.GetAll();
//separating items
var todoitem = data.Where(p => p.Status == WorkItemStatus.ToDo).ToArray();
var inProgressItem = data.Where(p => p.Status == WorkItemStatus.InProgress).ToArray();
var doneItem = data.Where(p => p.Status == WorkItemStatus.Done).ToArray();
//filling up items in respective list
listBox1.Items.AddRange(todoitem);
listBox2.Items.AddRange(inProgressItem);
listBox3.Items.AddRange(doneItem);
//refreshing the list
listBox1.Refresh();
listBox2.Refresh();
listBox3.Refresh();
}