The foreach loop works on a collection, array, or list. All of the items in a listbox can be inspected with a foreach loop. Note: we can't remove an item in the foreach loop, becaseu that would change the list of items.
private void Form1_Load(object sender, EventArgs e) { int blank = 0; //Count the number of blanks in the list box foreach(String s in listBox1.Items) { if (s == "") blank++; } this.Text = "You had " + blank + " blank lines"; //Remove all of the blank lines for (int i = 0; i < blank; i++) { this.listBox1.Items.Remove(""); } }
