Server Error In '/XCopyDeploy' Application

hi there,

i'm using visual web developer express edition 2005 to make internal web site using asp.net and sql server 2005 express,sql server management studio for attaching the db(company.mdf),windows xp professional and IIS for deploying the project.the project is working fine when i run it using localhost with explorer only the default page is running but when i access the other pages which have connection with the DB i got this error
Unable to open the physical file "D:XCopyDeployApp_Datacompany.mdf". Operating system error 5: "5(error not found)".
An attempt to attach an auto-named database for file D:XCopyDeployApp_Datacompany.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

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: Unable to open the physical file "D:XCopyDeployApp_Datacompany.mdf". Operating system error 5: "5(error not found)".
An attempt to attach an auto-named database for file D:XCopyDeployApp_Datacompany.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

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): Unable to open the physical file "D:XCopyDeployApp_Datacompany.mdf". Operating system error 5: "5(error not found)".
An attempt to attach an auto-named database for file D:XCopyDeployApp_Datacompany.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734963
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) +33
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +137
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +83
System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1770
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +17
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +149
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +70
System.Web.UI.WebControls.GridView.DataBind() +4
System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() +69
System.Web.UI.Control.EnsureChildControls() +87
System.Web.UI.Control.PreRenderRecursiveInternal() +41
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360


the connection string is

<connectionStrings>

<add name="companyConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=D:XCopyDeployApp_Datacompany.mdf;Integrated Security=SSPI;Connect Timeout=30;User Instance=True"

providerName="System.Data.SqlClient" />

</connectionStrings>

the strange thing is!.when i put the port number in the path.it worked fine but this when i open the visual studio

(http://localhost:1324/XCopyDeploy/vaccation.aspx) but when i closed the visual studio i got the same error!/

also, i should deploy the project on web server (windows server 2003) using same tools

what should i do to fix this error.im adminstrator on my machine and the server also.