/// <remarks>大文字小文字は区別しない。</remarks>
public string GetWord(string word)
{
- if (String.IsNullOrEmpty(this.From) || String.IsNullOrEmpty(this.To))
+ if (string.IsNullOrEmpty(this.From) || string.IsNullOrEmpty(this.To))
{
throw new InvalidOperationException("empty from or to");
}