I want to Cancel (not delete) order on Shopify as API in my application.

Currently I am using this piece of code to cancel order

public IActionResult Cancel(double? id)
{
    _httpClient.BaseAddress = new Uri("");
    APISecurity.InitHeader(_httpClient);
    var response = _httpClient.PostAsync($"orders /{id}/cancel.json/").Result;  //I want something like _httpClient.CancelAsync

Using postman by post API is working fine.