title: How ngIf can validate multiple conditions in Angular Reactive Forms
body: <p>Could you please guide me how to use <code>*ngIf</code> in Angular 9 for multiple conditions as shown below. The following is not working for me.</p>
  <pre class="lang-html prettyprint-override"><code>*ngIf=&quot;abc !! xyz&quot;
  </code></pre>
  <p>However, it is working for an individual condition like</p>
  <pre class="lang-html prettyprint-override"><code>*ngIf=&quot;abc&quot; 
  </code></pre>
  <p>or</p>
  <pre class="lang-html prettyprint-override"><code>*ngIf=&quot;xyz&quot;
  </code></pre>
  <p>and the TS code is:</p>
  <pre class="lang-js prettyprint-override"><code>radioButtonChanged($event){
     let radioValue = event.target['value'];
  
     console.log(radioValue);
     if(radioValue =='abc'){
       this.abc = true;
       this.xyz = false;
     } else{
       this.abc=false;
       this.xyz = true;
     }      
  }
  </code></pre>