var httpContent = new MultipartFormDataContent();
httpContent.Add(new StringContent(param1), "param1");
httpContent.Add(new StringContent(param2), "param2");
var result = await client.PostAsync("endpoint1", httpContent);
var httpContent = new MultipartFormDataContent();
httpContent.Add(new StringContent(param1), "param1");
httpContent.Add(new StringContent(param2), "param2");
var result = await client.PostAsync("endpoint1", httpContent);