ListItem Constructor (String)
.NET Framework (current version)
Initializes a new instance of the ListItem class with the specified text data.
Assembly: System.Web (in System.Web.dll)
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The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model. |
<!-- The following example demonstrates adding items to and removing items from ListBox controls. When an item is selected in ListBox1, a new ListBoxItem with the same value can be created and added to ListBox2, if ListBox2 does not already contain an item with that text. --> <%@ Page Language="C#" AutoEventWireup="True" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>ListItem Example</title> <script runat="server"> void AddBtn_Click(Object Sender, EventArgs e) { if (ListBox1.SelectedIndex > -1) { if (ListBox2.Items.FindByText(ListBox1.SelectedItem.Text) == null) { ListItem Item = new ListItem(ListBox1.SelectedItem.Text); Item.Value = ListBox1.SelectedItem.Value; ListBox2.Items.Add(Item); } } } void DelBtn_Click(Object Sender, EventArgs e) { if (ListBox2.SelectedIndex > -1) { ListBox2.Items.Remove(ListBox2.SelectedItem); } } </script> </head> <body> <h3>ListItem Example</h3> <form id="form1" runat="server"> <table> <tr><td> <asp:ListBox id="ListBox1" Width="100px" runat="server"> <asp:ListItem Value="Value 1">Item 1</asp:ListItem> <asp:ListItem Value="Value 2">Item 2</asp:ListItem> <asp:ListItem Value="Value 3">Item 3</asp:ListItem> <asp:ListItem Value="Value 4">Item 4</asp:ListItem> <asp:ListItem Value="Value 5" Selected="True">Item 5</asp:ListItem> <asp:ListItem Value="Value 6">Item 6</asp:ListItem> </asp:ListBox> </td><td> <asp:button Text="--->" OnClick="AddBtn_Click" runat="server" /><br /> <asp:button Text="<---" OnClick="DelBtn_Click" runat="server" /> </td><td> <asp:ListBox id="ListBox2" Width="100px" runat="server"/> </td></tr> </table> </form> </body> </html>
.NET Framework
Available since 1.1
Available since 1.1
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