Property Index As Integer

#Get 
msg = VSMessage(0, DateTime.Now, VSSeverity.Error, "IronPython script", "My test message", "Additional info")
index = msg.Index

#Set 
msg.Index = Index

//Get 
VSMessage msg = new VSMessage(0, DateTime.Now, VSSeverity.Error, "C# script", "My test message", "Additional info");
int index = msg.Index;

//Set 

msg.Index = index;