index.html

<form #ItemsForm="ngForm" class="container my-3" >
  <section *ngFor="let item of Items; let i=index">
     <div>
       <mat-form-field appearance="outline" class="pr-4" >
         <mat-label>Name</mat-label>
         <input matInput [(ngModel)]="item.Name" name="Name_{{i}}">
        </mat-form-field>
      
       <mat-form-field appearance="outline" class="pr-4" >
         <mat-label>Date of Birth</mat-label>
         <input matInput [matDatepicker]="DateofBirth_i" [(ngModel)]="item.DateofBirth" name="DateofBirth_{{i}}">
          <mat-datepicker-toogle matSuffix [for]="DateofBirth_i"></mat-datepicker-toogle>
          <mat-datepicker #DateofBirth_i></mat-datepicker>
        </mat-form-field>
      
        <mat-checkbox [(ngModel)]="item.isAccepted" name="isAccepted_i">
         <mat-label> Is Accepted?</mat-label>
        </mat-checkbox>
      
        <button mat-raised-button (click)="itemBelge_i.click();itemFileNumber(i)"> Choose File </button>
        <div *ngIf="Items[i].Belge!==null">{{item[i].File.name}} </div>
   
     <div>
       <button mat-button (click)="removeItem(i)">
          <mat-icon > close </mat-icon >
            Delete
        </button>
        <button mat-button (click)="addItem($event)">
          <mat-icon > add </mat-icon >
          Add
        </button>
   </div>
       
 </section>
 <input hidden #itemFile_i (change)="handleAddFileInputFrom($event.target.files)" type="file">
 </form>