Get selected objects and set the property.
| Parameter | Description | 
|---|---|
| PropertyId | identifier name or number of the property to be set; values are defined in class Eplan::EplApi::DataModel::Properties (in)(obligatory) | 
| PropertyIdentName | identifier name of the user defined property to be set (in)(obligatory) | 
| PropertyIndex | if the property has indices, the index; mostly 0 (in)(obligatory) | 
| PropertyValue | new value of the property (in)(obligatory) | 
When PAGE_LASTMANUMODIFICATIONDATE property is set, then PropertyValue has to be formatted this way:
 long milliseconds = (DateTime.Now.Ticks - new DateTime(1970, 1, 1).Ticks) / TimeSpan.TicksPerSecond;
 context.AddParameter("PropertyValue", milliseconds.ToString());