diff --git a/C# Coding Standards and Naming Conventions.md b/C# Coding Standards and Naming Conventions.md
index 8688f5b..61afea7 100644
--- a/C# Coding Standards and Naming Conventions.md	
+++ b/C# Coding Standards and Naming Conventions.md	
@@ -414,6 +414,17 @@ public class BarcodeReadException : System.Exception
 
 ***Why: consistent with the Microsoft's .NET Framework and easy to read.***
 
+#### 26. Do use suffix Any, Is, Have or similar keywords for boolean identifier :
+
+```csharp 
+// Correct
+public static bool IsNullOrEmpty(string value) {
+    return (value == null || value.Length == 0);
+}
+```
+
+***Why: consistent with the Microsoft's .NET Framework and easy to read.***
+
 ## Offical Reference
 
 1. [MSDN General Naming Conventions](http://msdn.microsoft.com/en-us/library/ms229045(v=vs.110).aspx)