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ExD.NameSpace/Program.cs

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+using MySystem.MySubSystem;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        Class1 cls = new MySystem.MySubSystem.Class1();
+    }
+}
+
+namespace MySystem.MySubSystem
+{
+    public class Class1
+    {
+        public int Calculate(int a, int b)
+        {
+            int abs_Sum = System.Math.Abs(a) + Math.Abs(b);
+            return abs_Sum;
+        }
+    }
+}