Listbox, Gridview and Database

hi check this sample to add selected item from listbox to grid:

in aspx:


   

   

       
       
       
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in cs:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Globalization;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
      
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        DataTable table = new DataTable();
        table.Columns.Add("item", typeof(int));
        foreach (ListItem li in ListBox1.Items)
        {
            if (li.Selected == true)
            {
                DataRow dr = table.NewRow();
                dr["item"] = li.Value;
                table.Rows.Add(dr);
            }
        }
        GridView1.DataSource = table;
        GridView1.DataBind();
    }
}