How do I send request to codeproject.ai server in C#

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C#

Receiver error; System.Net.WebException: 'The remote server returned an error: (405) Method Not Allowed.'

What I have tried:

I have tried the following code in VS2022 .NET 8.0 Windows Forms;

WebClient webClient = new WebClient();
webClient.QueryString.Add("image", "\\\\LS210D314\\share\\Files\\Photos\\My Pictures\\Critters\\Heron\\Blue Heron\\Photos\\3_2024-01-20_07-46-23_large.jpg");
string result = webClient.DownloadString("http://localhost:32168/v1/vision/detection");

ResultsBox.Text = result;

What is the correct C# method for the server?