How To Disable Selected Item In List Box

Question

I have a ListBox in my WinForms application and I want to disable some items on that list, for example if I right click on an item , it gets disabl

Answer 1

There is no native Disable/Enable items in ListBox. However you can do some tricks.

First you need to define you own class for item which will have Enabled property.

Then you need to subscribe to MouseDown event and check which (righ or left) button was clicked. And based on x,y position get the item that was clicked. Then you will set the Enabled property to True/False. Below are some examples :

Your custom class

    public class Item
    {
        public Item()
        {
            // Enabled by default
            Enabled = true;
        }
        public bool Enabled { get; set; }
        public string Value { get; set; }
        public override string ToString()
        {
            return Value;
        } 
    }

The MouseDown event

private void listBox1_MouseDown(object sender, MouseEventArgs e)
{

    var item = (Item)listBox1.Items[listBox1.IndexFromPoint(e.X, e.Y)];
    if (e.Button == System.Windows.Forms.MouseButtons.Right)
    {
        item.Enabled = false;
    }
    else
    {
        item.Enabled = true;

    }
}