public static string Check_user_email(string email)
    {
        string retval = "";

        ReturnClass.ReturnDataTable dt = new ReturnClass.ReturnDataTable();
        dl_Usr_Registration         db = new dl_Usr_Registration();
        bl_Usr_Registration         ur = new bl_Usr_Registration();

        ur.Email = email;
        dt       = db.check_user_email(ur);
        if (dt.table.Rows.Count > 0)
        {
            retval = "false";
        }
        else
        {
            retval = "true";
        }
        return(retval);
    }
    public static string Check_user_mobile(string mobile)
    {
        string retval = "";

        ReturnClass.ReturnDataTable dt = new ReturnClass.ReturnDataTable();
        dl_Usr_Registration         db = new dl_Usr_Registration();
        bl_Usr_Registration         ur = new bl_Usr_Registration();

        ur.Telephone_No = mobile;
        dt = db.check_user_mobile(ur);
        if (dt.table.Rows.Count > 0)
        {
            retval = "false";
        }
        else
        {
            retval = "true";
        }
        return(retval);
    }