copying from one list box to another list box

asp:code

<div>
<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
</asp:ListBox>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:ListBox ID="ListBox2" runat="server"></asp:ListBox>
</div>

satya

Sanoop, if this helps please login to Mark As Answer. | Alert Moderator

source code:
protected void Button1_Click(object sender, EventArgs e)
{
string ItemsAlreadyExists = "";
for (int i = 0; i <= ListBox1.Items.Count - 1; i++)
{
if (ListBox1.Items[i].Selected)
{
if (!ListBox2.Items.Contains(ListBox1.Items[i]))
{
ListBox2.Items.Add(ListBox1.Items[i]);
}
else
{
ItemsAlreadyExists += Convert.ToString(ListBox1.Items[i].Text) + ",";
}
}
}
if (ItemsAlreadyExists != "")
{
Response.Write(ItemsAlreadyExists.TrimEnd(',') + " Already exists in the ListBox");
}
ListBox2.ClearSelection();
}

satya

Sanoop, if this helps please login to Mark As Answer. | Alert Moderator