Response.Redirect in new window

public class RedirectHelper
{
///

/// If you don't specify a target or you specify the target to be "_self",
/// then it will redirect within the current window, so a regular Response.Redirect occurs.
/// If you specify a different target, like "_blank", or if you specify window features,
/// then you want to redirect to a new window, and we write out the appropriate script.
///

///
///
///
public void Redirect(string url, string target, string windowFeatures)
{
HttpContext context = HttpContext.Current;
if ((String.IsNullOrEmpty(target)
target.Equals("_self", StringComparison.OrdinalIgnoreCase)) &&
String.IsNullOrEmpty(windowFeatures))
context.Response.Redirect(url);
else
{
Page page = (Page)HttpContext.Current.Handler;
if (page == null)
throw new InvalidOperationException("Cannot redirect to new window outside Page context.");
url = page.ResolveClientUrl(url);
string script;
if (!String.IsNullOrEmpty(windowFeatures))
script = @"window.open(""{0}"", ""{1}"", ""{2}"");";
else
script = @"window.open(""{0}"", ""{1}"");";
script = String.Format(script, url, target, windowFeatures);
ScriptManager.RegisterStartupScript(page, typeof(Page), "Redirect", script, true);
}
}