Suggest using TestMethodAttribute for parameterized tests (#367)

DataTestMethodAttribute is not recommended anymore - https://learn.microsoft.com/en-us/dotnet/core/testing/mstest-analyzers/mstest0044

Author: ManishJayaswal

agents/CSharpExpert.agent.md

@@ -177,7 +177,7 @@ bash
 
 * Class `[TestClass]`, test `[TestMethod]`
 * Setup/teardown: `[TestInitialize]`, `[TestCleanup]`
-* Parameterized tests: **use `[DataTestMethod]` + `[DataRow]`**
+* Parameterized tests: **use `[TestMethod]` + `[DataRow]`**
 
 ### Assertions