Is it possible to update the modifiedby and LastModified date properties using the API?

Question

Hello I am currently creating a standalone C# application that is using the COM API to create an object in M-Files and I would like to be able to set the modified date and modified by but I have tried every method I can think of and it still does not set the property. I am able to set all properties successfully except the modified by and last modified. I was wondering if this is even possible and if so what method should I be using. Here are the different options that I tried 
 1.) Creating the propertyValue and adding it to the propertyValues object and passing it in with all the other properties during object creation. 
 
 PropertyValue modByProp= new PropertyValue()
modByProp.PropertyDef = 23
modByProp.TypedValue.SetValue(MFDataType.MFDatatypeLookup, propertyInfo.itemID);
propvals.Add(-1, modByProp);
vault.ObjectOperations.CreateNewObjectEx(objectTypeID, propvals, sourceFiles, isSingle, true, null); 
 2.) Creating the object and updating it using SetLastModificationInfoAdmin 
 ObjectVersionAndProperties ovp = vault.ObjectOperations.CreateNewObjectEx(objectTypeID, propertyValues, sourceFiles, isSingle, false, null);
vault.ObjectPropertyOperations.SetLastModificationInfoAdmin(ovp.VersionData.ObjVer, UpdateLastModifiedBy: true, modByPropval.Value, UpdateLastModified: true, modifiedPropval.Value);
vault.ObjectOperations.CheckIn(ovp.ObjVer); 
 
 3.) using the setProperty finction instead of SetLastModificationInfoAdmin 
 ObjectVersionAndProperties ovp = vault.ObjectOperations.CreateNewObjectEx(objectTypeID, propertyValues, sourceFiles, isSingle, false, null);
vault.ObjectPropertyOperations.SetProperty(ovp.VersionData.ObjVer, modByPropval);
vault.ObjectOperations.CheckIn(ovp.ObjVer); 
 Any Help would be very much appreciated.

Craig Hawker · Answer

I just tried this using a local C# application and it seemed to work: 
 var properties = new PropertyValues();
{
 var classProperty = new PropertyValue();
 classProperty.PropertyDef = (int)MFBuiltInPropertyDef.MFBuiltInPropertyDefClass;
 classProperty.Value.SetValue(MFDataType.MFDatatypeLookup, (int)MFBuiltInDocumentClass.MFBuiltInDocumentClassUnclassifiedDocument);
 properties.Add(0, classProperty);
}
{
 var nameProperty = new PropertyValue();
 nameProperty.PropertyDef = (int)MFBuiltInPropertyDef.MFBuiltInPropertyDefNameOrTitle;
 nameProperty.Value.SetValue(MFDataType.MFDatatypeText, "hello world");
 properties.Add(0, nameProperty);
}
var obj = vault.ObjectOperations.CreateNewObjectEx(0, properties, CheckIn: false);
{
 var lastModifiedBy = new TypedValue();
 lastModifiedBy.SetValue(MFDataType.MFDatatypeLookup, 35);
 var lastModifiedDate = new TypedValue();
 lastModifiedDate.SetValue(MFDataType.MFDatatypeTimestamp, new DateTime(2000, 1, 1, 0, 0, 0));
 vault.ObjectPropertyOperations.SetLastModificationInfoAdmin
 (
 obj.ObjVer, 
 true, lastModifiedBy, 
 true, lastModifiedDate
 );
}
vault.ObjectOperations.CheckIn(obj.ObjVer); 
 
 (in the above I was connected as Craig Hawker, but I set the last modified by to "test", and set the last modified by datetime to 2000-01-01)

Is it possible to update the modifiedby and LastModified date properties using the API?

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