I have two radio buttons. When I select "Partially paid", then input element formControlName="paidamount" will be displayed in screen along with <div class="formGroup". I have used binding, but this is not working. <mat-radio-group aria-label="Select an option" formControlName="fullypaid" [(ngModel)]="fullypaidvalue"> <mat-radio-button value="true" [checked]="true">Fully Paid</mat-radio-button> <mat-radio-button value="false">Partially Paid</mat-radio-button> </mat-radio-group> <p>{{fullypaidvalue}}</p> <div class="formGroup" [class.d-none]="fullypaidvalue"> <label for="paidamount" class="form-label" style="margin-top: 10pt;">Paid Amount</label> <input type="text" class="form-control form-control1" id="paidamount" formControlName="paidamount" placeholder="paidamount" name="paidamount" style="margin-left: 20pt;"> </div> My stackblitz link is https://stackblitz.com/github/reegan2024/mygithubrepo?file=README.md Can someone please help me Continue reading...