Connection String For SQL Server Not Working

I have the Visual Studio 2005 Team Suite trial version and the SQL Server 2005 trial (which came with team suite) installed in my machine.

When I installed the SQL Server 2005 I installed it in the Windows Authentication mode.  So every time I open SQL Server 2005 it doesnt ask for Username/Password (Its greyed out).  The only thing available were:

Server Type: Database Engine

ServerName: ServerSue

Authentication: Windows Authentication.

Here is my Problem:

I created a small application in C#.  In the web.config file I created the following:

<appSettings>

<add key="resumecon" value="SERVER=ServerSue;database=Resume;"/>

</appSettings>

Then in the Code behind I created the following string:

string strResCon = ConfigurationManager.AppSettings["resumecon"].ToString();

Then in  method (for a Login page) I created the connection string as follows and wrote code to insert some values into the Resume database.  I called this method on a button click event.

SqlConnection conLogin = new SqlConnection(strResCon);

When I run the page and when I click the button I get the following error:

Login failed for user ''. The user is not associated with a trusted SQL Server connection.


I think some thing is wrong in the addkey of webconfig?  How do I change this?