4011 When Trying To Delete Record From Sql Database

Hi i have a very annying problem that i cant seem to solve by myself. I have developed a content managment system for a webpage where people can manage the page. It's almost done except for the fact that i cant seem to delete records from my sql express database.

To access the database i use an sql login in my code to delete witchever record is retrived from a querystring in the URL field. Below is a sample of my delete code when a button is pressed. protected void ButtonDelete_Click(object sender, EventArgs e)
{
string dID = Request.QueryString["dID"];

string myConnectionString = @"Data Source=SRVWEBSQLEXPRESS;Initial Catalog=se;User ID=xx;Password=xx";
SqlConnection myConnection = new SqlConnection(myConnectionString);
string myDeleteQuery = "DELETE FROM drift WHERE dID = @dID";
SqlCommand myCommand = new SqlCommand(myDeleteQuery);
myCommand.Parameters.AddWithValue("dID", dID);

myCommand.Connection = myConnection;
myConnection.Open();
myCommand.ExecuteNonQuery();
myCommand.Connection.Close();

Response.Redirect("list.aspx");
}

When the i run the code on my development machine located at 10.12.0.80 and the server is located at 10.12.1.65 and this is where the databse is located. The strangest thing is that when i press my deletebutton while debugging in VS2008 on my devmachine the record is deleted! BUT when i run the code live on the server i get an error. See the below log file taken from the windows 2003 server application log.

Event Type: Information
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1314
Date:  2008-04-07
Time:  10:26:45
User:  N/A
Computer: SRVWEB
Description:
Event code: 4011
Event message: An unhandled access exception has occurred.
Event time: 2008-04-07 10:26:45
Event time (UTC): 2008-04-07 08:26:45
Event ID: 8bdda96aeee44448b570891c593bdb3e
Event sequence: 242
Event occurrence: 1
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1015505475/Root-1-128520196339603398
    Trust level: Full
    Application Virtual Path: /
    Application Path: C:wwwwebsite
    Machine name: SRVWEB
 
Process information:
    Process ID: 5156
    Process name: w3wp.exe
    Account name: NT AUTHORITYNETWORK SERVICE
 
Request information:
    Request URL: http://website/cms/drift/editdrift.aspx?dID=19
    Request path: /cms/drift/editdrift.aspx
    User host address: 10.12.1.1
    User: webmaster
    Is authenticated: True
    Authentication Type: Forms
    Thread account name: NT AUTHORITYNETWORK SERVICE

Could anyone help me solve this problem. Thanks.