Updated sample

Author: wiazur

dotnet/Search/BingImageSearchInsights.cs

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+using Newtonsoft.Json;
+using System;
+using System.Text;
+using System.Net;
+
+/* This sample makes a call to the Bing Image Search API with a query image and returns visually similar images.
+ * Details about each similar image, also known as "insights", are returned in the JSON response.
+ * Documentation: https://docs.microsoft.com/en-us/azure/cognitive-services/bing-web-search/
+ */
+
+namespace BingImageSearchInsights
+{
+    class Program
+    {
+        // Add your Azure Bing Search v7 subscription key to your environment variables
+        static string subscriptionKey = Environment.GetEnvironmentVariable("BING_SEARCH_V7_SUBSCRIPTION_KEY");
+        // Add your Azure Bing Search v7 endpoint to your environment variables  
+        static string endpoint = Environment.GetEnvironmentVariable("BING_SEARCH_V7_ENDPOINT") + "/bing/v7.0/images/details";
+
+        // Place an image (for example a jpg or png) in your bin\Debug\netcoreapp3.0 folder.
+        const string imageFile = "YOUR-IMAGE.jpg";
+
+        static void Main()
+        {
+            Console.OutputEncoding = Encoding.UTF8;
+
+            WebClient client = new WebClient();
+            client.Headers["Ocp-Apim-Subscription-Key"] = subscriptionKey;
+            client.Headers["ContentType"] = "multipart/form-data";
+            // Returns all insights
+            byte[] response = client.UploadFile(endpoint + "?modules=All", imageFile);
+            var json = Encoding.Default.GetString(response);
+
+            // Pretty print the result
+            dynamic parsedJson = JsonConvert.DeserializeObject(json);
+            Console.WriteLine("\nBing Image Insights JSON Response:\n");
+            Console.WriteLine(JsonConvert.SerializeObject(parsedJson, Formatting.Indented));
+
+            Console.ReadLine();
+        }
+    }
+}