cannot open database "northwind" why

i am getting an error ... given below and my web.config is also given below

can any one help me is my connection string right ...
i am using sql server 2005 ..
my system name is soft18 ..

Server Error in '/prjLogin' Application.

---

Cannot open database "Northwind" requested by the login. The login failed.
Login failed for user 'SOFT18\Administrator'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Cannot open database "Northwind" requested by the login. The login failed.
Login failed for user 'SOFT18\Administrator'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[SqlException (0x80131904): Cannot open database "Northwind" requested by the login. The login failed.
Login failed for user 'SOFT18\Administrator'.]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +115
System.Data.SqlClient.TdsParser.ThrowExcepti....................
........................
................
...................

//web.config

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<connectionStrings>

<add name="QuickStartSqlServer" connectionString="Server=localhost\SQLExpress;Integrated Security=SSPI;Database=Northwind;"
providerName="System.Data.SqlClient" />
</connectionStrings>

<system.web>
<authentication mode="Forms">
<forms name=".ASPXAUTH"
loginUrl="Login.aspx"
protection="All"
timeout="30"
path="/"
requireSSL="false"
slidingExpiration="true"
defaultUrl="Login.aspx"
cookieless="UseDeviceProfile"
enableCrossAppRedirects="false"/>
</authentication>

<membership defaultProvider="QuickStartMembershipSqlProvider"
userIsOnlineTimeWindow="15">
<providers>
<add
name="QuickStartMembershipSqlProvider"
type="System.Web.Security.SqlMembershipProvider, System.Web,
Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a"
connectionStringName="QuickStartSqlServer"
enablePasswordRetrieval="false"
enablePasswordReset="true"
requiresQuestionAndAnswer="true"
applicationName="LoginControls"
requiresUniqueEmail="true"
passwordFormat="Hashed"/>
</providers>
</membership>

<roleManager
enabled="true"
cacheRolesInCookie="true"
defaultProvider="QuickStartRoleManagerSqlProvider"
cookieName=".ASPXROLES"
cookiePath="/"
cookieTimeout="30"
cookieRequireSSL="false"
cookieSlidingExpiration="true"
createPersistentCookie="false"
cookieProtection="All">
<providers>
<add name="QuickStartRoleManagerSqlProvider"
type="System.Web.Security.SqlRoleProvider,
System.Web, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a"
connectionStringName="QuickStartSqlServer"
applicationName="LoginControls"/>
</providers>
</roleManager>
<authorization>
<allow users="*"/>
</authorization>
<compilation debug="true"/>
</system.web>

</configuration>You really, really, really should not do that becasue this leaves a security hole for SQL injection, imagine you user input (which should be treaten as suspious), enter in the textbox2 the following text:

'',NULL'); DROP DATABASE model; --

THis would cause the model database to be dropped, I am sure you don′t want to do this. :-) Always use parametrized queries for the access, that can′t be comnposed as easy as in the sample code of yours.

HTH, Jens Suessmeyer.

http://www.sqlserver2005.de