(C#) ASP.NET - ExecuteScalar()

Command.ExecuteScalar();

		System.Data.OleDb.OleDbConnection objConn;
		System.Data.OleDb.OleDbCommand objCmd;
		String strConnString,strSQL;
		Object myScalar;

		strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
		Server.MapPath("database/mydatabase.mdb")+";Jet OLEDB:Database Password=;";
		objConn = new System.Data.OleDb.OleDbConnection(strConnString);
		objConn.Open();
		
		strSQL = "SELECT MAX(Used) FROM customer";

        objCmd = new System.Data.OleDb.OleDbCommand();

        objCmd.Connection = objConn;
        objCmd.CommandType = CommandType.Text;
        objCmd.CommandText = strSQL;

        myScalar = objCmd.ExecuteScalar();

        objCmd = null;
        objConn.Close();
        objConn.Close();
        objConn = null;