title: How can get a substring from a string in C#?
body: <p>I have a large string and it’s stored in a string variable, <em>str</em>. And I want to get a substring from that in C#.</p>
  <p>Suppose the string is: <code>&quot; Retrieves a substring from this instance. The substring starts at a specified character position, &quot;</code></p>
  <p>The substring result what I want to display is: <code>The substring starts at a specified character position.</code></p>