How to consume HTTP API request using QUERY STRING in C# -API KEY ?

proceed as

using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.BaseAddress = new Uri("http://localhost:1234/");
client.DefaultRequestHeaders.Add("api-key", "YourKeyHere");
//query string inside dictionary
var values = new Dictionary();
values.Add("querystringkey", "value");
var content = new FormUrlEncodedContent(values);
using (HttpResponseMessage response = await client.PostAsync("api/Endpoint", values))
{
using (HttpContent content =response.Content)
{
string mycontent = await content.ReadAsStringAsync();
}
}
}

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