Cannot import C# library in sharepoint 2010 application page

Question

I want to reference a class library method inside the application aspx page but I keep getting the dreaded Yellow Screen of Death with the error message

CS0103: The name 'Common' does not exist in the current context.

I followed the steps mentioned here to add the project to GAC and I also restarted IIS via IIS Manager.

Here's my application page:

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Import Namespace="Microsoft.SharePoint.ApplicationPages" %>
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ApplicationPage1.aspx.cs" Inherits="SharePointProject1.Layouts.SharePointProject1.ApplicationPage1" DynamicMasterPageFile="~masterurl/default.master" %>

<asp:Content ID="PageHead" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">

</asp:Content>

<asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server">
<asp:Label ID="lblTest" runat="server" />
<%= Common.Lib.Utility.GetStatusImage("approved") %>
</asp:Content>

<asp:Content ID="PageTitle" ContentPlaceHolderID="PlaceHolderPageTitle" runat="server">
Application Page
</asp:Content>

<asp:Content ID="PageTitleInTitleArea" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server" >
My Application Page
</asp:Content>

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Pre-Sales Consultant (Microsoft Business Intelligence Solutions)
Tech One Global

Answer 1

did you Imported the name space of that C# library in a page with its version, public key token ?

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Regards, Dharnendra Shah, MCTS,MCPD - Sharepoint 2010 Application Development Blog: http://ds-sharepoint2010blogs.blogspot.in/ Email: [e-mail]

Answer 2

Yes I tried importing the namespace as well but I didn't use any version or public token. Where do I get the version and public token?

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Pre-Sales Consultant (Microsoft Business Intelligence Solutions)
Tech One Global

Answer 3

Go to GAC,

see the properties of DLL

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Regards, Dharnendra Shah, MCTS,MCPD - Sharepoint 2010 Application Development Blog: http://ds-sharepoint2010blogs.blogspot.in/ Email: [e-mail]