using Microsoft.VisualStudio.TestTools.UnitTesting; [TestClass] public class MyTestClass { [TestMethod] public void TestMethod() { int a = 10; int b = 20; Assert.AreNotEqual(a, b); } }In this example, the Assert.AreNotEqual method is used to check if two integer values are not equal. The method takes two integer arguments and verifies that they are not equal. This method is part of the Microsoft.VisualStudio.TestTools.UnitTesting namespace in the Microsoft.VisualStudio.TestPlatform.TestFramework package library.