Fix bug in perf analysis sample

DotNetPerfAnalysisIntro/README.md

@@ -4,3 +4,16 @@ This sample project aims to demonstrate how to analyze and improve the performan
 service using Visual Studio profilers.
 
 In this exercise we attempt to improve the latency and throughput of a simple API.
+
+To run the load test:
+
+```sh
+cd load-tests
+k6 run --vus <num_virtual_users> --duration <duration> ./basic.js
+```
+
+e.g.
+
+```sh
+k6 run --vus 200 --duration 30s ./basic.js
+```

DotNetPerfAnalysisIntro/SampleApi/DataReader.cs

@@ -24,7 +24,7 @@ public static async Task<List<LocationData>> ReadDataAsync(Stream input)
                 }
                 else if (word.StartsWith("temp:"))
                 {
-                    temperature = double.Parse(word.Split(':')[1]);
+                    double.TryParse(word.Split(':')[1], out temperature);
                 }
             }