C# Array problems

        private void assetDownloadTrigger_Click(object sender, EventArgs e)
        {
            WebClient assetClient = new WebClient();
            for (int i = 0; i < numOfItems;)
            {
                i++;
                if(versionDropdown.SelectedIndex == i){
                    assetClient.DownloadFile("https://s3-eu-west.amazonaws.com/delvegame/versions/" +versionList[numOfItems]+".txt")
            }
        }