How to copy items of listbox to items of a combobox?

Question

I want to copy all the items in a listbox to items of a combobox on runtime so need help

Answer 1

Can't you just set the combobox's datasource to the same one the Listbox is using?

Answer 2

for (int i = 0; i < listBox1.Items.Count; i++)
{
     comboBox1.Items.Add(listBox1.Items[i]);
}

EDIT:

If you are populating the list control via the 'DataSource' property remember to set the source listbox 'DisplayMember' and 'ValueMember' properties:

listBox1.DisplayMember = "DisplayMember";
listBox1.ValueMember = "ValueMember";

and also the target combobox properties to the same values:

comboBox1.DisplayMember = "DisplayValue";
comboBox1.ValueMember = "ValueMember";

When an object is added to the list the listbox checks the 'DisplayMember' property. If the value of 'DisplayMember' doesn't exist or has its value set to an empty string the ToString() method is called on the object contained in the list item to obtain the text to display in the list.