Insert Record.

Try this.

using(var client = newHttpClient())
{
client.BaseAddress = newUri("api url");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(newMediaTypeWithQualityHeaderValue("application/json"));
var department = new Department() { DepartmentName = "Test Department" };
HttpResponseMessage response = awaitclient.PostAsJsonAsync("api/Department", department);
if (response.IsSuccessStatusCode)
{
// Get the URI of the created resource.
UrireturnUrl = response.Headers.Location;
Console.WriteLine(returnUrl);
}
}

For more details check the below links

https://www.c-sharpcorner.com/article/calling-web-api-using-httpclient/

https://www.aspsnippets.com/Articles/Call-Consume-Web-API-using-HttpClient-in-ASPNet-C.aspx

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