Non-invocable member 'File' cannot be used like a method while generating Reports
<p>I used a method for generating report in my previous project and tried to use the same method in the new project. However, I encounter <strong><em>"Non-invocable member 'File' cannot be used like a method"</em></strong> error and File cannot be recognized. By looking at the references of file, it seems to be <code>FileContentResult Controller.File()</code> in the previous project, but <code>System.IO.File()</code> in the new project (even if I remove using System.IO; from the references lines, I encounter <strong>"The name 'File' does not exist in the current context"</strong> error). Any idea to fix the problem?</p>

<pre><code>public static FileResult GenerateReport()
{
    EmployeeTableAdapter ta = new EmployeeTableAdapter();
    EmployeeDS ds = new EmployeeDS();

    ds.Employee.Clear();
    ds.EnforceConstraints = false;

    ta.Fill(ds.Employee);

    ReportDataSource rds = new ReportDataSource();
    rds.Name = "ReportingDataSet";
    rds.Value = ds.Employee;

    ReportViewer rv = new Microsoft.Reporting.WebForms.ReportViewer();
    rv.ProcessingMode = ProcessingMode.Local;
    rv.LocalReport.ReportPath = System.Web.HttpContext.Current.                                 
        Server.MapPath("~/Reporting/Employee.rdlc");
    rv.LocalReport.EnableHyperlinks = true;
    rv.LocalReport.EnableExternalImages = true;

    // Add the new report datasource to the report.
    rv.LocalReport.DataSources.Add(rds);
    rv.LocalReport.EnableHyperlinks = true;
    rv.LocalReport.Refresh();

    byte[] streamBytes = null;
    string mimeType = "";
    string encoding = "";
    string filenameExtension = "";
    string[] streamids = null;
    Warning[] warnings = null;

    streamBytes = rv.LocalReport.Render("PDF", null, out mimeType, out 
        encoding, out filenameExtension, out streamids, out warnings);

    return File(streamBytes, mimeType, "Application" + "_" + ".pdf");
}
</code></pre>

<p><br/>
<strong>Note:</strong> I use MVC5 and SQL Server.</p>