When moving an item from one listbox to another, how do I add to the string going into the second listbox?

Question

Ok, so my application is a simple baby gift registry. In the left groupBox, I have 2 input text boxes(item, store) and a listBox(lstWish) for output. This side is the Wish List. In the right groupBox, I have 2 input text boxes(firstName, lastName) and a listBox(lstPurchased) for output. Upon a button_click, the selected item from lstWish is moved to lstPurchased. lstWish currently outputs like "Item available at Store".

When the item goes from lstWish to lstPurchased I want to add "from firstName lastName". So the lstPurchased will read "Item available at Store from firstName lastName". How do I add the second half of the string while moving it over?

Here is the method that moves the item over:

private void MoveListBoxItems(ListBox lstWish, ListBox lstPurchased)
    {
        ListBox.SelectedObjectCollection sourceItems = lstWish.SelectedItems;
        foreach (var item in sourceItems)
        {
            lstPurchased.Items.Add(item);
        }
        while (lstWish.SelectedItems.Count > 0)
        {
            lstWish.Items.Remove(lstWish.SelectedItems[0]);
        }
    }

And here is the code for the button click:

private void btnBuy_Click(object sender, EventArgs e)
    {
        if (txtFirst.Text == "" || txtLast.Text == "")
        {
            MessageBox.Show("Please enter first and last name.", "Warning");
            this.DialogResult = DialogResult.None;
        }
        else
        {
            DialogResult result = MessageBox.Show("Click Yes to confirm purchase. Click No to cancel."
                , "Thank You", MessageBoxButtons.YesNo);
            if (lstWish.SelectedIndex >=0)
            {
                MoveListBoxItems(lstWish, lstPurchased);                   
            }
            else
            {
                return;
            }
        }
    }

The list is a collection is a List. There are two custom classes, Gift and Guest. Here is the class Gift that has the toString that populates the listBox:

namespace GiftRegistry
{
class Gift
{
    #region Fields
    private string _item;
    private string _store;
    //private string _purchaser;
    #endregion

    #region Properties
    public string Item { get; set; }//modify the set clauses to include regex and title case and          .trim()

    public string Store { get; set; }

    //public string Purchaser { get; set; }
    #endregion

    #region Constructors
    public Gift()
    {
        this.Item = String.Empty;
        this.Store = String.Empty;
    }

    public Gift(string Item, string Store)
    {
        this.Item = Item;
        this.Store = Store;
    }
    #endregion

    #region Method
    public override string ToString()
    {
        return string.Format("{0} availble at {1}", this.Item, this.Store);
    }
    #endregion        
}

}

Guest class:

class Guest
{
    #region Fields
    private string _lastName;
    private string _firstName;
    #endregion

    #region Properties
    public string LastName
    {
        get { return _lastName; }
        set
        {                
            if (value == null)
                throw new ArgumentNullException("Name", "Please enter a name");
            _lastName = value.Trim();
        }
    }
    public string FirstName 
    {
        get { return _firstName; }
        set
        {//see above about regular expressions
            if (value == null)
                throw new ArgumentNullException("Name", "Please enter a name");
            _firstName = value.Trim();
        }
    }
    #endregion

    #region Constructors
    public Guest()
    {
        this.LastName = String.Empty;
        this.FirstName = String.Empty;
    }

    public Guest(string lastName)
    {
        this.LastName = lastName;
        this.FirstName = String.Empty;
    }

    public Guest(string lastName, string firstName)
    {
        this.LastName = lastName;
        this.FirstName = firstName;
    }
    #endregion

    #region Method
    public override string ToString()
    {
        return string.Format("{0} {1}", this.FirstName, this.LastName);
    }
    #endregion

}

Answer 1

在MoveListBoxItems() ，可以将firstName和lastName与以下内容连接：

lstPurchased.Items.Add(string.Format("{0} from {1} {2}", item.ToString(), firstName, lastName));