Could not load file or assembly 'itextsharp' but i have added the reference and so an

Could not load file or assembly 'itextsharp, Version=5.4.1.0, Culture=neutral, PublicKeyToken=8354ae6d2174ddca' or one of its dependencies. The system cannot find the file specified.

<asp:DropDownList ID="DropDownListDownloadCv0" runat="server">
<asp:ListItem>CV</asp:ListItem>
<asp:ListItem>PDF</asp:ListItem>
</asp:DropDownList>

 protected void DownloadCv_Click(object sender, ImageClickEventArgs e)
{
{
string sDirPath = Server.MapPath("~/PDF_WORD/Docs");
var ObjSearchDir = new DirectoryInfo(sDirPath);
if (!ObjSearchDir.Exists)
{
ObjSearchDir.Create();
}
string strFileName =
HttpContext.Current.Server.MapPath("~/PDF_WORD/Docs/Test." + DropDownListDownloadCv0.SelectedValue.ToString() +
"");
var objfileinfo = new FileInfo(strFileName);
// step 1: creation of a document-object
var document = new Document();


if (objfileinfo.Exists)
{
File.Delete(strFileName);
PdfWriter.GetInstance(document, new FileStream(strFileName, FileMode.Create));
}
else
PdfWriter.GetInstance(document, new FileStream(strFileName, FileMode.Create));
// step 2:
// we create a writer that listens to the document
//StringBuilder strB = new StringBuilder();
var sw = new StringWriter();

document.Open();
var hTextWriter = new HtmlTextWriter(sw);



lblphonenumber.RenderControl(hTextWriter);
String strHtml1 = sw.ToString();


var styles = new iTextSharp.text.html.simpleparser.StyleSheet();
var hw = new iTextSharp.text.html.simpleparser.HTMLWorker(document);
hw.Parse(new StringReader(strHtml1));

document.Close();

}



}
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