Thanks your reply. I will answer you in more detail so please give me a time.

If you could send me your code, it will be more quickly.

Sincerely

Hello Shobhana Suara
Thank you for posting in our forum.

You can apply style to header row using “headerClasses”.
https://www.infragistics.com/products/ignite-ui-angular/docs/typescript/latest/classes/igxcolumncomponent.html#headerclasses

  
  
  
  
    
      {{val | date:'yyyy/MM/dd'}}
    
  
  

::ng-deep {
  .name-column-header .igx-grid__th-title {
    color: red;
    text-decoration: underline;
  }
}

Here is a sample application which uses the above codes.
7888.igx-grid-column-styling