The CSS not working when I try to take print

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ASP.NET

C#5.0

SQL-Server-2008R2

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

}
protected void Button1_Click(object sender, EventArgs e)
{
Session["ctrl"] = Panel1;
Control ctrl = (Control)Session["ctrl"];
PrintWebControl(ctrl);
}
public static void PrintWebControl(Control ControlToPrint)
{
StringWriter stringWrite = new StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
if (ControlToPrint is WebControl)
{
Unit w = new Unit(100, UnitType.Percentage);
((WebControl)ControlToPrint).Width = w;
}
Page pg = new Page();
pg.EnableEventValidation = false;
HtmlForm frm = new HtmlForm();
pg.Controls.Add(frm);
frm.Attributes.Add("runat", "server");
frm.Controls.Add(ControlToPrint);
pg.DesignerInitialize();
pg.RenderControl(htmlWrite);
string strHTML = stringWrite.ToString();
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Write(strHTML);
HttpContext.Current.Response.Write("<script>window.print();</script>");
HttpContext.Current.Response.End();
}
}
I have tried using Java scripts but the problem remains the same . I am not understanding why CSS is not Working .