title: MVC - Controller - Make a Simple Math Calculation - Variable + 1
body: <p>I have a little problem to make a simple math calculation in the controller.</p>
  
  <p>what I try to do is add +1 to a number of a variable.</p>
  
  <p>Here is an example for you to understand better what I try to do:</p>
  
  <pre><code> var a= formcollection["Id_this"];
  
   var next = a + 1;
  </code></pre>
  
  <p><strong>Note:</strong> the value of "<code>Id_this</code>" is <code>"1"</code>.</p>
  
  <p>The result I need for the variable <code>next</code> is <code>2</code></p>
  
  <p>My problem is that the result of the variable <code>next</code> is <code>"12"</code>.</p>