static void Main() { /* * Test1 a = new Test1(); * //line 23 error - 'Test1' is an ambiguous reference between 'NameSpaceTest1.Test1' and 'NameSpaceTest2.Test1' * a.Testfunc(); */ Test4 b = new Test4(); b.TestFun4(); // op- Test Fun 4 Test12 a = new Test12(); a.Testfunc(); // op- Test Fun 12 Test21 c = new Test21(); c.Testfunc(); // op- Test Fun 21 }