bool isProcessing = false;
    public override NSIndexPath WillSelectRow (UITableView tableView, NSIndexPath indexPath)
    {
        if(!isProcessing)
            return indexPath;
        return null;
    }

    public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
    {
        isProcessing = true;

        var data = GetDataAt(indexPath);

        ProcessRowSelection(tableView, indexPath, data);

        isProcessing = false;

    }

public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
    if(!isProcessing)
    {
        isProcessing = true;
        var data = GetDataAt(indexPath);
        ProcessRowSelection(tableView, indexPath, data);
    }
    else
    {
        isProcessing = false;
    }
}