public bool RemoveAttrDictItem(string key)
{
bool success = true;
m_deviceForm.attrData.attrDictAccess.WaitOne();
if (m_deviceForm.attrData.attrDict.ContainsKey(key))
success = m_deviceForm.attrData.attrDict.Remove(key);
m_deviceForm.attrData.attrDictAccess.ReleaseMutex();
return success;
}