title: Custom struct with output like DateTime
body: <p>it's difficult to write my Question in the title...
  I want to ask how I can create a struct that is like DateTime.
  When I print a DateTime variable it returns Day.Month.Year...
  Then I create a struct (just an example)</p>
  
  <pre><code>struct Test
  {
     int a;
     int b;
     int c;
  }
  
  class program
  {
     static void Main()
     {
        Test customstruct;
        Console.WriteLine(customstruct);
     }
  }
  </code></pre>
  
  <p>I want to print(a.b.c)
  Of course I could write a string in the output, but if I use a datagrid for example, the struct has to return a.b.c</p>
  
  <p>I hope that I explaine it good enough,
  Thankful for any help!</p>