diff --git a/dotnet/test/common/DevTools/DevToolsProfilerTest.cs b/dotnet/test/common/DevTools/DevToolsProfilerTest.cs
index 985a336e2c94e..a663278e7bc69 100644
--- a/dotnet/test/common/DevTools/DevToolsProfilerTest.cs
+++ b/dotnet/test/common/DevTools/DevToolsProfilerTest.cs
@@ -131,12 +131,12 @@ private void ValidateProfile(CurrentCdpVersion.Profiler.Profile profiler)
         {
             Assert.That(profiler, Is.Not.Null);
             Assert.That(profiler.Nodes, Is.Not.Null);
-            Assert.That(profiler.StartTime, Is.Not.Null);
-            Assert.That(profiler.EndTime, Is.Not.Null);
+            Assert.That(profiler.StartTime, Is.Not.Zero);
+            Assert.That(profiler.EndTime, Is.Not.Zero);
             Assert.That(profiler.TimeDeltas, Is.Not.Null);
             foreach (var delta in profiler.TimeDeltas)
             {
-                Assert.That(delta, Is.Not.Null);
+                Assert.That(delta, Is.Not.Zero);
             }
 
             foreach (var node in profiler.Nodes)
diff --git a/dotnet/test/common/DevTools/DevToolsTestFixture.cs b/dotnet/test/common/DevTools/DevToolsTestFixture.cs
index 18bb78988557f..44f2317370420 100644
--- a/dotnet/test/common/DevTools/DevToolsTestFixture.cs
+++ b/dotnet/test/common/DevTools/DevToolsTestFixture.cs
@@ -39,7 +39,7 @@ public void Setup()
             devTools = driver as IDevTools;
             if (devTools == null)
             {
-                Assert.Ignore("{0} does not support Chrome DevTools Protocol", EnvironmentManager.Instance.Browser);
+                Assert.Ignore($"{EnvironmentManager.Instance.Browser} does not support Chrome DevTools Protocol");
                 return;
             }