private void removeSelectedToolStripMenuItem_Click(object sender, EventArgs e)
{
this.listBoxWords.BeginUpdate();
var words = new string[this.listBoxWords.SelectedItems.Count];
for (int i = 0; i < this.listBoxWords.SelectedItems.Count; i++)
words[i] = this.listBoxWords.SelectedItems[i].ToString();
foreach (string word in words)
this._wordList.Remove(word);
this.listBoxWords.EndUpdate();
}