I think you can do that, but why wouldn't you simply create a module and skip all the extra coding?

To create a module you need:

1. an XML template file with a .dnn extension

2. a web control

3. Zip it and upload it as a module to your dotnetnuke site.

I was trying to figure out the same thing, then I found the site http://www.dnnwiki.net.  This is for creating c# modules, but it's very simple.  Download the WhoAreYou.zip file to look at these files.  This guy did an AMAZING job.

Example whoareyou.dnn

<dotnetnuke version="3.0" type="Module">
  <folders>
    <folder>
      <name>WhoAreYou</name>
      <description>Says who is logged in and which Security Roles they belong</description>
      <version>01.01.01</version>
      <modules>
        <module>
          <friendlyname>Who Is Logged in Module</friendlyname>
          <controls>
            <control>
              <title>View WhoAreYou</title>
              <src>WhoAreYou.ascx</src>
              <type>View</type>
            </control>
          </controls>
        </module>
      </modules>
      <files>
        <file>
          <name>WhoAreYou.ascx</name>
        </file>
        <file>
          <name>WhoAreYou.ascx.cs</name>
        </file>
      </files>
    </folder>
  </folders>
</dotnetnuke>

Example WhoAreYou.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WhoAreYou.ascx.cs" Inherits="WhoAreYou" %><asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

Example WhoAreYou.ascx.cs

public partial class WhoAreYou : DotNetNuke.Entities.Modules.PortalModuleBase
{
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            DotNetNuke.Entities.Users.OnlineUserInfo mRoles = new DotNetNuke.Entities.Users.OnlineUserInfo();
            DotNetNuke.Security.Roles.RoleController mUserRoles = new DotNetNuke.Security.Roles.RoleController();
            DotNetNuke.Entities.Users.UserInfo mUser = new DotNetNuke.Entities.Users.UserInfo();
            mUser = DotNetNuke.Entities.Users.UserController.GetCurrentUserInfo();
           
            string showRoles = "";
           
            foreach (string i in mUserRoles.GetRolesByUser(mUser.UserID, mRoles.PortalID))
            {
                showRoles += i.ToString() + ", ";
            }
           
            Label1.Text = "Logged in as: " + mUser.Username + "<br>Roles: " + showRoles.ToString();
        }
        catch (Exception err)
        {
            Label1.Text = "Note: User info failed";
        }

    }
}