Selecting multiple items in a ListBox

Question

I am using Listbox for display a list. I need select all above item if an item is selected and also do not allow unseleted above items.

Answer 1

This should help:

private void Form1_Load(object sender, EventArgs e)
     {

      listBox1.SelectionMode = SelectionMode.MultiSimple;
      listBox1.MouseDown += listBox1_MouseDown;
}

private void listBox1_MouseDown(object sender, MouseEventArgs e)
     {
      int selectedItem = listBox1.IndexFromPoint(e.Location);

      listBox1.SelectedIndices.Clear();
      for (int i = 0; i <= selectedItem; i++)
      {
       listBox1.SelectedIndices.Add(i);
      }
     }