title: @helper missing in NET.CORE MVC (NET.CORE SDK 2.2 )
body: <p>I am migrating existing MVC application to the ASP.NET Core MVC application using SDK netcoreapp2.2.</p>
  
  <p>I am using some custom razor helper in that, but dotnetcore2.2 doesn't support <strong>@helper</strong> keyword.</p>
  
  <p>showing error like </p>
  
  <blockquote>
    <p>error RZ1002: The helper directive is not supported.</p>
  </blockquote>
  
  <p>ASP.NET MVC Example:</p>
  
  <pre><code>@helper RenderFeedMappingTable(bool hasMatchesFound,  List&lt;IntelligentFeedMapping&gt; lstIntelligentFeedMappingAll, List&lt;IntelligentFeedMapping&gt; lstIntelligentFeedMapping = null, bool isRoot = true, bool isParentMappingDone = false)
  {
      string id = "";
      if (isRoot)
      {
          id = hasMatchesFound ? "tblMatchesFound" : "tblMatchesNotFound";
      }   
      &lt;table&gt;&lt;tr&gt;&lt;td&gt;&lt;input type="text" id="@id"/&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
  }
  </code></pre>