HttpClient not supporting PostAsJsonAsync method C#

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I am trying to call a web API from my web application. I am using .Net 4.5 and while writing the code I am getting the error HttpClient does not contain a definition PostAsJsonAsync method.

Below is the code:

HttpClient client = new HttpClient();
client.BaseAddress = new Uri("http://localhost:51093/");
client.DefaultRequestHeaders.Accept.Add(
   new MediaTypeWithQualityHeaderValue("application/json"));
var user = new Users();
user.AgentCode = 100;
user.Remarks = "Test";
user.CollectionDate = System.DateTime.Today;
user.RemittanceDate = System.DateTime.Today;
user.TotalAmount = 1000;
user.OrgBranchID = 101;

var response = client.PostAsJsonAsync("api/AgentCollection", user).Result;

and I am getting the error message:

Error: ‘System.Net.Http.HttpClient’ does not contain a definition for
‘PostAsJsonAsync’ and No extension method ‘PostAsJsonAsync’ accepting a first argument of
type ‘System.Net.Http.HttpClient’ could be found (are you missing
a using directive or an assembly reference?)

Please have a look and advice me.

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