A delegate implemented by observers that are interested in variable changed events.

Public Delegate Sub VariableChangedEventHandler(object sender, VariableChangedEventArgs e) As void

public delegate void VariableChangedEventHandler(object sender, VariableChangedEventArgs e);

var.Changed += new VariableChangedEventHandler(OnVarChanged);

var.Changed -= new VariableChangedEventHandler(OnVarChanged);