diff --git a/Examples/ExampleApps.cs b/Examples/ExampleApps.cs
index 998fcb4..e234629 100644
--- a/Examples/ExampleApps.cs
+++ b/Examples/ExampleApps.cs
@@ -238,8 +238,13 @@ public static ExampleAppOptions BuildOptions(
                     StartupTimeoutSeconds: 180,
                     BuildEnv: o => new Dictionary<string, string>
                     {
+                        // The example reads the _51DEGREES_ names. Released
+                        // versions of it read the two older names, so both
+                        // are set until every language has released.
+                        ["_51DEGREES_RESOURCE_KEY"] = o.ResourceKey,
                         ["SUPER_RESOURCE_KEY"] = o.ResourceKey,
                         // the endpoint must include the api/v4 path
+                        ["_51DEGREES_CLOUD_ENDPOINT"] = new Uri(o.CloudEndpoint, "api/v4/").ToString(),
                         ["FIFTYONE_CLOUD_ENDPOINT"] = new Uri(o.CloudEndpoint, "api/v4/").ToString(),
                         ["ASPNETCORE_URLS"] = $"http://localhost:{o.Port}",
                         // run on a newer .NET runtime if the exact one isn't installed
diff --git a/Examples/ExampleAppsTests.cs b/Examples/ExampleAppsTests.cs
index 3f271e6..0e5ce16 100644
--- a/Examples/ExampleAppsTests.cs
+++ b/Examples/ExampleAppsTests.cs
@@ -1,3 +1,5 @@
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
@@ -74,5 +76,23 @@ public void Descriptors_Rust_BuildsAndRunsWithCargo()
             Assert.IsTrue(rust.Args.Contains("dd-web-getting-started-cloud"),
                 "run args should target the cloud getting-started web binary");
         }
+
+        [TestMethod]
+        public void Descriptors_Dotnet_SetsTheUnderscoreNames()
+        {
+            var dotnet = ExampleApps.Descriptors["dotnet"];
+            var env = dotnet.BuildEnv(new ExampleAppOptions(
+                Port: 5123,
+                CloudEndpoint: new Uri("https://cloud.example.test/"),
+                ResourceKey: "key",
+                ExtraEnv: new Dictionary<string, string>()));
+            Assert.AreEqual("key", env["_51DEGREES_RESOURCE_KEY"],
+                "the example reads the resource key from this name");
+            Assert.AreEqual(
+                "https://cloud.example.test/api/v4/",
+                env["_51DEGREES_CLOUD_ENDPOINT"],
+                "the example reads the endpoint, with its api/v4 path, "
+                + "from this name");
+        }
     }
 }