Resharper cannot resolve the CrystalDecisions namespace in a webproject in VS2005. Crystal reports assemblies are placed in the GAC. The example below was just a small test, where I created a new website, placed nothing on the aspx page and added the shown code to the codebehind file. It gives an error highlight on the word ReportDocument. using System; using CrystalDecisions.CrystalReports.Engine; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { ReportDocument oRPT = new ReportDocument(); } }