C# .NET - Web Part Error

Hello Friends,

I have sharepoint services running on my Windows 2003 R2 Server. From VS2005, I created a sample web part like below (just to see how it looks).

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Serialization;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.WebPartPages;
using System.Reflection;

[assembly: AssemblyKeyFile("sample.snk")]

namespace WebPartLibrary1
{

    /// <summary>
    /// Description for WebPart1.
    /// </summary>
    [DefaultProperty("Text"),
        ToolboxData("<{0}:WebPart1 runat=server></{0}:WebPart1>"),
        XmlRoot(Namespace = "WebPartLibrary1")]
    public class WebPart1 : Microsoft.SharePoint.WebPartPages.WebPart
    {
        private const string defaultText = "";

        private string text = defaultText;

        [Browsable(true),
            Category("Miscellaneous"),
            DefaultValue(defaultText),
            WebPartStorage(Storage.Personal),
            FriendlyName("Text"),
            Description("Text Property")]
        public string Text
        {
            get
            {
                return text;
            }

            set
            {
                text = value;
            }
        }

        /// <summary>
        /// Constructor for the class.
        /// </summary>
        public WebPart1()
        {
            this.Title = "This is a test web part";
        }

        protected override void RenderWebPart(HtmlTextWriter output)
        {
            output.Write(SPEncode.HtmlEncode(Text));
            //Create a Label
            Label testLabel = new Label();
            //Write the Text
            testLabel.Text = "Hello World";
            //Add the label control to the page
            this.Controls.Add(testLabel);
            testLabel.RenderControl(output);           
        }

  
    }
}

and  my dwp file look like this

<?xml version="1.0" encoding="utf-8"?>
<WebPart xmlns="http://schemas.microsoft.com/WebPart/v2" >
 <Title>WebPart1</Title>
 <Description>WebPart1.</Description>
 <Assembly>WebPartLibrary1</Assembly>
 <TypeName>WebPartLibrary1.WebPart1</TypeName>
 <!-- Specify initial values for any additional base class or custom properties here. -->
</WebPart>

I made "safe control" entry in the web.config file (c:\inetpub\wwwroot) like below....
 <SafeControl Assembly="WebPartLibrary1" Namespace="WebPartLibrary1" TypeName="*" Safe="True" />

Also copied the WebPartLibrary1.dll to the c:\windows\assembly (GAC).

Still when I try to drag the web part in a wep part page... I get error like
below...

"Web Part or Web Form Control on this Web Part Page cannot be displayed or imported because it is not registered on this site as safe."

I have even reinstalled IIS and Sharepoint Servies. My sharepoint runs as (All Unassigned)".

Can any body tell me what could be the reason for error and how to fix it.  I am really struck up with this error.

Thanks in Advance.

TMRK

Have you tried changing the security level of the entire application from minimal to medium in the web.config?

Also check if the below workaround from the Newsgroup helps

<extract>

To determine the correct PublicKeyToken value
for the Assembly attribute of the SafeControl tag for your
Web Part, perform the following workaround:

In Windows Explorer, open the c:\inetpub\wwwroot\bin
folder.
In a separate window, open the c:\Windows\Assembly folder.
(C:\Windows\Assembly exposes the contents of the Global
Assembly Cache (GAC).)
Drag your Web Part assembly (your sample from these
procedures should be named SimpleWebPart.dll) from the
c:\inetpub\wwwroot\bin folder into the c:\Windows\Assembly
folder.
In the c:\Windows\Assembly folder, right-click your
assembly, and then click Properties.
Copy the Public Key Token value, and then paste it into
the SafeControl tag for your assembly.
In the c:\Windows\Assembly folder, right-click your
assembly, and then click Delete. 
Note You can also determine the PublicKeyToken
value of your Web Part assembly by using the sn.exe
command-line utility:
sn.exe -T c:\inetpub\wwwroot\bin\SimpleWebPart.dll

</extract>