Connection String for SQL 2008

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C#

I am using Dreamweaver CS5, asp.net C# as my frontend, and SQL 2008 as my backend. This is basically like a inventory system. so i just wrote a small program to test my connection. My problem is that when i try to establish a connection i get an error:

void Page_Load()
{
  string connectionString ="Data Source=SERVERNAME; Initial Catalog=DATABASENAME; Integrated Security=SSPI;" ;

  SqlConnection con = new SqlConnection(connectionString);

  try{
      //try to open connection
      con.Open();
      lblInfo.Text = "Server Version: " + con.ServerVersion;
      lblInfo.Text = "<br />Connection Is: " + con.State.ToString();
  }
  catch(Exception err)
  {
      //Handle an error by displaying the information
      lblInfo.Text = "Error reading the database. " + err.Message;
  }
  finally
  {
      //make sure conneciton is closed
      con.Close();
      lblInfo.Text += "<br />Now Connection Is: " +
      con.State.ToString();
  }

Result:

Error reading the database. Login failed for user 'someone'

where someone is my webserver name. what i want is that user needs to be the current user, so it would be myname as the user trying to connect to sql with windows authentication. My SQL db has users that can read and write to it. so i am stuck and don't really know how to fix this simple problem. Any help would be of great help, thanks.