How to establish connection with API through username and password ?

StatusCode - 401
IsSuccessStatusCode - False
ReasonPhrase - Unauthorized

var acadiaUrl = "https://uat.abc.com/marginqa";

            HttpClientHandler handler = new HttpClientHandler();
            
            HttpClient httpClient = new HttpClient(handler);
            var byteArray = Encoding.ASCII.GetBytes("username:password");
            httpClient.DefaultRequestHeaders.Authorization = 
                 new AuthenticationHeaderValue
                 ("Basic", Convert.ToBase64String(byteArray));

            HttpResponseMessage response = 
                await httpClient.GetAsync(acadiaUrl);
            HttpContent content = response.Content;