SPUtility.Redirect – Redirect Pages at _layouts folder, the Safest Way

When you need to redirect to pages located at _layouts folder, the safest way is to use SPUtility.Redirect method. The following are sample to redirect to settings.aspx page:

SPUtility.Redirect("settings.aspx", SPRedirectFlags.UseSource | SPRedirectFlags.RelativeToLayoutsPage, HttpContext.Context);

If you want to redirect to custom pages at _layout folder, see below:

SPUtility.Redirect("sharepointmalaya/customadminsettings.aspx", SPRedirectFlags.Static | SPRedirectFlags.RelativeToLayoutsPage | SPRedirectFlags.RelativeToLocalizedLayoutsPage, HttpContext.Current);

Details on the SPRedirectFlags enumerations can be found here.