title: kendo UI disable/enable required data rule
body: <p>am using Kendo Ui for our MVC project and being very much new to kendoUI stuck with a problem where i need to disable/enable data-validate rule on one of my testbox on the basis of some business rules.</p>
  
  <p>below is the HTML for control :</p>
  
  <pre><code> &lt;pre&gt;&lt;input id="txtLastName" type="text" data-tooltip="external" data-tooltip-text="tooltipdemotext" class="form-control k-textbox" data-validate="true" data-rule-message="Last Name cannot be blank" data-rule-name="required" placeholder="Enter Last Name" /&gt;&lt;/pre&gt;
  </code></pre>
  
  <p>Could someone please help me in this.</p>