Redirecting Pages as per User Designation in my sql table

protected void ValidateUserInfo(string user, string pass)
    {

        string EmpId = txtempid.Text;
        string designation = Designationddl.Text; 
        SqlConnection con = null;
        string strConn = "Data Source=.;Initial Catalog=db_employee;User ID=sa;Password=;";
        con = new SqlConnection(strConn);
        con.Open();
        string sql = "select * from employees where EMPID=@EmpID and PASSWORDE=@Passworde";
        SqlCommand cmd = new SqlCommand(sql, con);
        cmd.Parameters.AddWithValue("@EmpID", user);
        cmd.Parameters.AddWithValue("@Passworde", pass);
        SqlDataAdapter ad = new SqlDataAdapter(cmd);
        ad.Fill(dt);


        SqlDataReader sqlRead = cmd.ExecuteReader();

        if (sqlRead.Read())
        {
            Session["EMPID"] = sqlRead["EMPID"];

        }


        if (dt.Rows.Count > 0)
        {
            Response.Redirect("employeePage.aspx");
        }
        else
        {
            ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Invalid Username and Password')</script>");
            txtempid.Text = "";
            txtpwd.Text = "";
        }
        con.Close();
    }