如何将列表框的行/索引限制为指定的数字？

Question

How do I restrict the amount of rows/indexes in a list box from a dynamic amount to a constant amount, like 5, programmatically? For example, a user inputs data from a text box to a list box up to the fifth row. If they attempt again, the program would reject the data the user entered which would prevent the list box from increasing the dynamic row size.

I tried using Selected Index and Selected Items properties such as:

if (ListBox1.SelectedItems.Count != 0)
{
    while (ListBox1.SelectedIndex == 5)
    {
        ListBox1.Items.RemoveAt(ListBox1.SelectedIndex);
    }
}

but it seems that the properties require a list box index to be selected.

Answer 1

if(ListBox1.Items.Count < 5){
     ListBox1.Items.Add("asd");
}

Instead of removing, while inserting, you can check if the number of items in ListBox1 are less than 5 and only add an item if it holds true.