title: How to split a string at the last '.' value
body: <p>I have a string like</p>
  
  <pre><code>    string str = "123.1.1.QWE";
      string[] seqNum = textBox1.Text.Split('.');
  </code></pre>
  
  <p>I want to split the string at the last . value and have to split into two  strings only like</p>
  
  <pre><code>seqNum[0]="123.1.1";
  seqNum[1]="QWE";
  </code></pre>
  
  <p>How can I split it into two strings at the last index.</p>
  
  <p>Thanks in advance.</p>