how to check web api is down or not in c# code

Question

Hi,

 

Thanks in advance :)

readonly string Baseurl = "http://localhost:123456/";
public string GetUserID_By_UserName(string Username)
{
string UserName = "";
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(Baseurl);
client.DefaultRequestHeaders.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
try
{
var response = client.GetAsync("api/Values/UserID_By_UserName?username=" + Username).Result;
// Here how i can check the api is working or not how to get the status to display of the api.
}
}
}