Keepalive time requested for the push connection. After an inactivity of this length on the push connection, a keepalive signal is sent by the Server. If it is 0, the keepalive time is decided by the Server. If it is too small, the Server may use a different keepalive time as well. 

The default setting is 0. 

public: __property long KeepaliveMillis;

public long KeepaliveMillis;

Public Property KeepaliveMillis() As long