How to manage C-sharp wpf ViewModel, you can call each other

how to manage C-sharp wpf ViewModel, you can call each other. Don"t say all use singleton mode.

Wpf
Mar.01,2021

using IOC, recommends using the Caliburn.Micro framework. Use its Ioc.get method to get

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e412a6-4388a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e412a6-4388a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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