Problem in ODBC connectivity between VC++ and SQL Server

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SQL-Server

MFC

VisualC++

I have written following code for connectivity

CDatabase database;
	CString SqlString;
	CString ssn,firstname;
	CString sDriver = _T("SQL Server");
	CString sDsn, sMc;
    sMc.Format(_T("MERILDSK33"));
	CString sFile = _T("C:\\Program Files\\Microsoft SQL Server\\MSSQL10.MSSQLSERVER\\MSSQL\\DATA\\DBTrial.mdf");
	sDsn.Format(_T("ODBC;DRIVER={%s};Server=%s;Database=%s;Trusted_Connection=yes"),sDriver,sMc,sFile);

	// You must change above path if it's different
	int iRec = 0; 	
	try
	{
		// Open the database
		database.Open(NULL,false,false,sDsn);
		// Allocate the recordset
		CRecordset recset(&database);
		// Build the SQL statement
		SqlString =  _T("select * from dbo.Person");
		// Execute the query
		recset.Open(CRecordset::forwardOnly,SqlString,CRecordset::readOnly);
		// Reset List control if there is any data
		while( !recset.IsEOF() )
		{
			recset.GetFieldValue(_T("SSN"),ssn);
			recset.GetFieldValue(_T("PersonFN"),firstname);
			recset.MoveNext();
		}
		database.Close();
	}
	catch(CDBException* e)
	{
		AfxMessageBox(e->m_strError);
	}

But on database.open line I get following error

Connection failed SQL State: '08004' SQL Server Error:4060 Server rejected the connection;Access to selected database has been denied

I tried to run as administrator,but still error comes ,Server name,mdf file name and path everything is correct.Server is also in running condition.The user in which I am ruuning is same as window Authantication of SQL server.I dont know what to do?
Please help