title: What does adding a "c" do in a VB.NET character array?
body: <p>I would like to use the String method IndexOfAny to check if a character exists in a specified string.</p>
  
  <p>Examples I've found online, of using the IndexOfAny method include a "c" after each character in the character array when using VB.NET. However, when I look at examples of simple character arrays in VB.NET, I dont see any such "c" after each character. What does the "c" do? Is it optional?</p>
  
  <pre><code>Dim s1 As String = "Darth is not my father."
  ' Find the first index of either "x" or "n"
  Dim i1 As Integer = s1.IndexOfAny(New Char() {"x"c, "n"c})
  </code></pre>