title: Requirement for Namespace "Using java.lang;"
body: <p>I am using Visual Studio 2010. There is a namespace "Using java.lang;" in the project and it is showing the error </p>
  
  <blockquote>
    <p>"The type or namespace name 'java' could not be found".</p>
  </blockquote>
  
  <p>What should I do for this error. Have to install any package?</p>