How to remove an item from a list box?

Question

Here's my previous code.
I hope someone can help me. Thanks.
public partial class frmJaialai : Form
List<Jaialai> source;
public frmJaialai()
InitializeComponent();
private void frmJaialai_Load(object sender, EventArgs e)
source = new List<Jaialai>();
private void btnAdd_Click(object sender, EventArgs e)
if (IsValidData())
int bet;
if (string.IsNullOrEmpty(txtJaialaiNumber.Text) || !Int32.TryParse(txtBet.Text, out bet))
MessageBox.Show("Must be a required field.", "Entry Error");
return;
var existingProduct = source.Where(x => x.JaialaiNumber == txtJaialaiNumber.Text).SingleOrDefault();
if (existingProduct != null)
existingProduct.Bet += bet;
else
source.Add(new Jaialai { Bet = bet, JaialaiNumber = txtJaialaiNumber.Text });
lstJaialaiNumbersList.DataSource = null;
lstJaialaiNumbersList.DataSource = source;
txtJaialaiNumber.Text = "";
// save the jai-alai numbers list on a txt file
const string sPath = @"C:\Automated Jai-alai Program\Jai-alai Numbers List.txt";
System.IO.StreamWriter SaveFile = new System.IO.StreamWriter(sPath);
foreach (var item in lstJaialaiNumbersList.Items)
SaveFile.WriteLine(item);
SaveFile.Close();
public class Jaialai
public string JaialaiNumber { get; set; }
public int Bet { get; set; }
public override string ToString()
return string.Format("{0} = {1}",
JaialaiNumber, "₱" + Bet.ToString());
private bool IsValidData()
return Validator.IsPresent(txtJaialaiNumber) &&
Validator.IsPresent(txtBet) &&
Validator.IsInt32(txtBet);

Answer 1

Hi ,
Here is a sample about remove Item from listBox.
// listBox1.Items.Clear();// remove all
int SelItemCount = listBox1.SelectedItems.Count;
for (int i = 0; i < SelItemCount; i++)
listBox1.Items.Remove(listBox1.SelectedItem);//remove which one you selected
You also can check in MSDN
https://msdn.microsoft.com/en-us/library/aa983551(v=vs.71).aspx
Best regards,
Kristin
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