Using-the-ListBox-to-select-list-items

Asp Control ASP.Net


            <%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        ListItem item = lstAllProducts.SelectedItem;
        if (item != null)
        {
            lstAllProducts.Items.Remove(item);
            lstFavoriteProducts.ClearSelection();
            lstFavoriteProducts.Items.Add(item);
        }
    }
    protected void btnRemove_Click(object sender, EventArgs e)
    {
        ListItem item = lstFavoriteProducts.SelectedItem;
        if (item != null)
        {
            lstFavoriteProducts.Items.Remove(item);
            lstAllProducts.ClearSelection();
            lstAllProducts.Items.Add(item);
        }
    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        foreach (ListItem item in lstFavoriteProducts.Items)
            lblResults.Text += "" + item.Text;
    }



    
            id="lstAllProducts"
        DataSourceID="srcProducts"
        DataTextField="Title"
        DataValueField="Id"
        Runat="server" />
            id="btnAdd"
        Text=">"
        ToolTip="Add List Item"
        Runat="server" 
        OnClick="btnAdd_Click" />
    
            id="btnRemove"
        Text="<"
        ToolTip="Remove List Item"
        Runat="server" 
        OnClick="btnRemove_Click" />


            id="lstFavoriteProducts"
        Runat="server" />

            id="btnSubmit"
        Text="Submit Form"
        Runat="server" OnClick="btnSubmit_Click" />

            id="lblResults"
        EnableViewState="false"
        Runat="server" />
            id="srcProducts"
        SelectCommand="SELECT Id, Title FROM Products"
        ConnectionString="<%$ ConnectionStrings:Products %>"
        Runat="server" />


File: Web.config


             connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />