Sending elements to form

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C#

WinForms

Heeelloo again...
I wanna send stringbuilder elements to other form. I tend to believe, that elements should be sent to listbox.
Here is the elements, i wanna send to form:

public string DisplayText
{
    get
    {
        if (this.Count == 0)
            return string.Empty;
        else
        {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.AppendLine("Order of" + DateTime.Now.ToString());
            stringBuilder.AppendLine();
            stringBuilder.AppendLine("Customer: " + Username);
            stringBuilder.AppendLine("-------------------------------------------------------------------------------------------------------------------------------------");
            foreach (var orderDetailBLL in this)
            {
                stringBuilder.AppendLine(orderDetailBLL.DisplayText);
            }
            stringBuilder.AppendLine("-------------------------------------------------------------------------------------------------------------------------------------");
            stringBuilder.AppendLine("Total: " + this.Total.ToString() + " $");
            return stringBuilder.ToString();
        }
    }
}

How can i do that? I've created listbox in the destination form. What should i do and write next?

Regards ;)