Exception when adding the binding

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C#

ASP.NET

IIS

C#4.0

Hi ...

When I am communicating the IIS to add the binding to web site using fallowing c# code

using (Microsoft.Web.Administration.ServerManager serverManager = new Microsoft.Web.Administration.ServerManager())
        {
            Microsoft.Web.Administration.Site site = serverManager.Sites[0];
            site.Bindings.Count();
            site.Bindings.Clear();

            if (site != null)
            {

                site.Bindings.Add("*:80:", "http");
            }
            serverManager.CommitChanges();

        }

when I am executing it throws the following error

Filename: redirection.config
Error: Cannot read configuration file due to insufficient permissions

Please Help to solve this exception.

thanks,
purna