Error : Type is not registered as safe

Question

I am creating a code behind file for the site page of sharepoint. The following page directive was used

    <%@ Assembly Name="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"%> 
<%@ Page Language="C#" CodeBehind="MyCustPage.cs" Inherits="CustPage.MyCustPage, CustPage, Version=1.0.0.0, Culture=neutral, PublicKeyToken=44ba9bb23d3f44ca" MasterPageFile="~masterurl/default.master" meta:progid="SharePoint.WebPartPage.Document"       %>
<%@ Import Namespace="Microsoft.SharePoint.WebPartPages" %> <%@ 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" %> <%@ Import Namespace="Microsoft.SharePoint" %> <%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>

My .cs file is as follows

   using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;

namespace CustPage
{
    public class MyCustPage:Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.Write("<script>alert('it worked')</script>");
        }
    }
}

I am getting this error :

The base type 'CustPage.MyCustPage' is not allowed for this page. The type is not registered as safe.

I have only done two things : first create an aspx file and then a separate class library. Any help would be appreciated

Answer 1

You have to register your assembly as safe to the SharePoint. If can set this property manually or do it with Visual Studio. Here is some references:

1. "The type is not registered as safe" when trying to add a web part installed by a WSP

2. http://www.ableblue.com/blog/archive/2010/08/20/adding-safe-controls-entries-in-visual-studio-2010/

3. http://blogit.create.pt/andrevala/2010/08/22/adding-an-assembly-to-safe-controls-in-sharepoint-tools-for-visual-studio-2010/

4. https://msdn.microsoft.com/en-us/library/ee805045.aspx

Keep in mind that you have to sign your assembly with SNK key to add it to Global Assembly Cache