This program will show
your systems free space information.
<%@ Page Language="C#"
AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td valign="top">
                    <asp:TreeView ID="TreeView1"
runat="server"></asp:TreeView>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>
Step 2)Put below code in your ASP.NET code behind
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default :
System.Web.UI.Page 
{
    protected void
Page_Load(object sender, EventArgs e)
    {
        foreach (System.IO.DriveInfo
drive in System.IO.DriveInfo.GetDrives())
        {
            TreeNode node = new TreeNode();
            node.Value
= drive.Name;
            if (drive.IsReady)
            {
               
node.Text = drive.Name + " - (free
space: " + drive.AvailableFreeSpace + ")";
            }
            else
               
node.Text = drive.Name + " - (not
ready)";
            this.TreeView1.Nodes.Add(node);
        }
    }
}

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