How to referesh value of side menu

Ionic Framework ionic-v3
1

i created side menu in app.ts file…now i want to update some values of side menu from home page …how could i do that?

updateHeaderval()
{
this.firm = ResponseString.getFirm();
this.bal = ResponseString.getBal();
this.disc = ResponseString.getCommision();
this.outstanding =ResponseString.getOutstanding();
}

<ion-menu [content]="content">
<ion-toolbar>
<!-- <ion-title>Menu</ion-title> -->
<ion-row>
    <ion-col><ion-label>{{firm}}</ion-label></ion-col>
</ion-row>
<ion-row>
    <ion-col width-25><div>Bal</div></ion-col>
    <ion-col width-75><div>{{outstanding}}</div></ion-col>
</ion-row>

<ion-row>
    <ion-col width-25><div>Disc</div></ion-col>
    <ion-col width-75><ion-label>{{disc}}</ion-label></ion-col>
</ion-row>
<ion-row>
    <ion-col width-25><div>O/S</div></ion-col>
    <ion-col width-75><div>{{outstanding}}</div></ion-col>
</ion-row>
</ion-toolbar>
<ion-content>
<ion-list>
<ion-item menuClose *ngFor="let item of pages" (click)="openPage(item)">
    <ion-avatar item-left>
      <img src="{{item.image}}" style="width:30px;height:30px;">
    </ion-avatar>
    <h2>{{item.title}}</h2>
  </ion-item>
</ion-list>

but when i update value form homepage…but it doesn’t render on side menu?