如何通过使用按钮将列表添加到其他表单上的列表框中

Question

Im trying to add to a listbox in a different form by using a button and a for loop, however it says "Clothes" does not contain a definition for the list box, i have the list box set to public since that's what i found online but has not fixed the problem. Its like its not recognised even when i type Clothes dot and is not there on the drop down menu. I have also tried F.CustomersList but this also does not work.

private  void LoadCity_Click(object sender, EventArgs e)       
{        
    Form F = new Clothes();

    if (F.ShowDialog() == DialogResult.OK)
    {
        for (int i = 0; i < _Mexico.Count; i++)
        {
            Clothes.CustomersList.Items.Add(_Mexico.ElementAt(i));
        }
    }             
}

Answer 1

for this you have to create a List in the Click_Event and set it to the CustomersList Property of the other Form.

private Form custForm;

private void LoadCity_Click(object sender, EventArgs e)   
{
    if(custForm == null)
    {
        custform = new Clothes(); //Clothes should be a Form
    }
    List cust = new List();
    for(int i = 0; i < _Mexico.Count; i++)
    {
        cust.add(_Mexico.ElementAt(i);
    }
    custform.CustomersList = cust;
}

The Property should look like this:

private List _CustomersList;
public List CustomersList
{
    get
    {
         return _CustomersList;
    }
    set
    {
        _CustomersList = value;
        //then do your stuff here
    }
}

Answer 2

Apart from making no sense to put things in the list after you have closed the form with the list you have to change the initialization from your Form from

Form F = new Clothes()

to

Clothes F = new Clothes()

because System.Windows.Forms.Form does not contain your public list. Then you have access to your Listbox through

F.CustomersList.Items.Add(_Mexico.ElementAt(i))

Just seen that Rufus already mentioned that in his comment, maybe you have to overthink your design.