How to insert a check box inside a list box in C#?

Question

I want a code to insert a checkbox inside a listbox in c sharp. on selecting the checkbox all the items in listbox must get selected.

Answer 1

You can use a CheckListBox to display a list with a check box next to each item.

But to make a single checkbox that selects everything in a list, it must be outside the list box (above or below or beside it). Then you can use code like:

public void SelectAllCheckBox_CheckedChanged(object s, EventArgs e) 
{
    foreach (var item in ListBox1.Items) 
    {
        item.Selected = SelectAllCheckBox.Checked;
    }
}

There is no control that has a single check box inside a list: eg this is what you mean:

+----------------------------------------+
| [x] Select All                         |
| Item one                               |
| Item two                               |
| Item three                             |
| Item four                              |
| Item five                              |
+----------------------------------------+

Instead you must use two controls: a checkbox and a separate list box:

[x] Select All                         

+----------------------------------------+
| Item one                               |
| Item two                               |
| Item three                             |
| Item four                              |
| Item five                              |
+----------------------------------------+