Redirect based on WeekDay using C# in ASP.Net

Dear Sir,

Display page as per calendar holiday using asp.net c#

I am trying to do but it's not working.

namespace hsptl
{
    public partial class indx : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.AppendHeader("Refresh", "10");

            if (!this.IsPostBack)
            {
                this.BindGrid();
                this.BindGrid1();
                //this.BindGrid2();
            }

            if  (DateTime.DATEPART(WEEKDAY,GETDATE(1)));
            {
                 Response.Redirect("/chng_pg.aspx");   
            }
            else            
            {
                  Response.Redirect("/indx.aspx");
            }
            Label2.Text = System.DateTime.Now.ToString("dd/MM/yyyy"); 
        }

        private void BindGrid()
        {
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand("SELECT doc_nm, spl,room,fn,an,rmk FROM aval where isactive='Active' "))
                {
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        cmd.Connection = con;
                        sda.SelectCommand = cmd;
                        using (DataTable dt = new DataTable())
                        {
                            sda.Fill(dt);
                            GridView1.DataSource = dt;
                            GridView1.DataBind();
                        }
                    }
                }
            }
        }

        private void BindGrid1()
        {
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand("SELECT doc_nm, spl,room,fn,an,rmk FROM vstr_doc where isactive='Active' "))
                {
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        cmd.Connection = con;
                        sda.SelectCommand = cmd;
                        using (DataTable dt = new DataTable())
                        {
                            sda.Fill(dt);
                            GridView2.DataSource = dt;
                            GridView2.DataBind();
                        }
                    }
                }
            }
        }
    }
}