C#

private object value;
//...
public object Value
{
  get { return this.value; }
  set
  {
    if (value is string) this.value = value;
    else
      try
      {
        bool b = Convert.ToBoolean(value);
        this.value = b;
      }
      catch
      {
        throw new ArgumentException("Invalid type.");
      }
    }
  }
}

<br />
public void TPMDataRemovedCallback(String k, Object v, CacheItemRemovedReason r){<br />
 TPMreason = r;<br />
 string tpmDataKey = "TPMDATA";<br />
 if(onTPMDataRemove == null)<br />
   onTPMDataRemove = new CacheItemRemovedCallback (this.TPMDataRemovedCallback);<br />
 DateTime NoAbsoluteExpiration = Cache.NoAbsoluteExpiration;<br />
 TimeSpan NoSlidingExpiration = Cache.NoSlidingExpiration;<br />
 CacheItemPriority Priority = CacheItemPriority.AboveNormal;<br />
 Context.Cache.Remove(tpmDataKey);<br />
 System.IO.FileInfo fileInfo = new System.IO.FileInfo(tpmFileName);<br />
 tpmData = tpm.LoadTPM();<br />
 try{<br />
   Context.Cache.Add(tpmDataKey,this.tpmData,this.tpmDataCacheDependency,NoAbsoluteExpiration,NoSlidingExpiration,Priority,onTPMDataRemove);<br />
 }<br />
 catch(System.Exception caught){<br />
   Console.WriteLine("Exception == " + caught);<br />
 }<br />
}<br />

// Somewhere in your constructor or some other
// initialization method call CacheFile with the appropriate key
private const string KEY1 = "File1.txt";
private const string KEY2 = "File2.txt";
private void CacheFile(string key)
{
  if (key == null) throw new ArgumentNullException("key");
  if (key.Length == 0) throw new ArgumentException("Invalid key.");
  if (Cache[key] == null)
  {
    string path = Server.MapPath("/docs/" + key);
    using (StreamReader reader = new StreamReader(path))
    {
      Cache.Add(
        key,
        reader.ReadToEnd(),
        new CacheDependency(path),
        Cache.NoAbsoluteExpiration,
        Cache.NoSlidingExpiration,
        CacheItemPriority.AboveNormal,
        new CacheItemRemovedCallback(CacheItemRemoved));
    }
  }
}
private void CacheItemRemoved(string key, object value,
  CacheItemRemovedReason reason)
{
  if (key == KEY1) CacheFile(KEY1);
  else if (key == KEY2) CacheFile(KEY2);
  // else: must've been something else - the point is to check the 'key'
}
public string File1Content
{
  get
  {
    CacheFile(KEY1);
    return Cache[KEY1];
  }
}
public string File2Content
{
  get
  {
    CacheFile(KEY2);
    return Cache[KEY2];
  }
}