c# - how to solve error "Exception has been thrown by the target of an invocation" -

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when run below code, showing error

"exception has been thrown target of invocation"

what can solve issue? 

public linqtoxml() {     xdocument document = xdocument.load(@"d:\\data.xml");     #region fetch books     var books = r in document.descendants("book")                  select new                 {                     author = r.element("author").value,                     title = r.element("title").value,                     genere = r.element("genre").value,                     price = r.element("price").value,                     publishdate = r.element("publish_date").value,                     description = r.element("description").value,                  };      foreach (var r in books)     {         com_xdocuments.items.add(r.publishdate + r.title + r.author);                                  }      #endregion  }

shouldn't be

xdocument document = xdocument.load(@"d:\data.xml");

both same @"d:\data.xml" , "d:\\data.xml"


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