How do I implement AsyncRead in C#?|OPC UA Standard|Forum|OPC Foundation

Oh I accidently posted in wrong subforum. It is in DA.

This is what I've tried so far, I keep getting "Value does not fall withing expected range". Why is that?

public void AsyncReadStart(string groupName, ListView formListView)
    {
        newListView = formListView;
        asyncGroupNames.Add(groupName);


        int numItems = structOPCServers[selectedNodeindex].opcServer.OPCGroups.GetOPCGroup(groupName).OPCItems.Count+1;
        structOPCServers[selectedNodeindex].a_serverHandles = new int[numItems];
        int i = 1;
        foreach(OPCItem item in structOPCServers[selectedNodeindex].opcGroup.OPCItems)
        {
            structOPCServers[selectedNodeindex].a_serverHandles.SetValue(item.ServerHandle, i);
            i++;
        }
        int transID = 1231;
        //int NumItems, ref Array ServerHandles, out Array Errors, int TransactionID, out int cancelIDs
        structOPCServers[selectedNodeindex].opcServer.OPCGroups.GetOPCGroup(groupName).AsyncRead(numItems, ref structOPCServers[selectedNodeindex].a_serverHandles, out structOPCServers[selectedNodeindex].a_errors, transID, out int cancelID);
        //Exception appears in line above.
        
        structOPCServers[selectedNodeindex].opcServer.OPCGroups.GetOPCGroup(groupName).AsyncReadComplete += OPC_Logic_AsyncReadComplete;
    }

Can you please provide me with example code, I've tried to cast it to different types and much more none seem to work.

This is metadata from IOPCGroup:

void AsyncRead(int NumItems, ref Array ServerHandles, out Array Errors, int TransactionID, out int CancelID);

AsyncRead(numItems, ref structOPCServers[selectedNodeindex].a_serverHandles, out structOPCServers[selectedNodeindex].a_errors, transID, out cancelID);

In my code:

numItems is int

structOPCServers[selectedNodeindex].a_serverHandles is Array

structOPCServers[selectedNodeindex].a_errors is Array

transID is int

cancelID is int

I really have no idea what to do.