C#

enum frequency
{
     Second,
     Minute,
     Hour,
     Day,
     Month,
     Year
}

public constructor()
{
       comBoxFrequency.Items.Add(frequency.Second);
       comBoxFrequency.Items.Add(frequency.Minute);
       comBoxFrequency.Items.Add(frequency.Hour);
       comBoxFrequency.Items.Add(frequency.Day);
       comBoxFrequency.Items.Add(frequency.Month);
       comBoxFrequency.Items.Add(frequency.Year);
}
public void buttonClick()
{
   switch (comBoxFrequency.SelectedText)
   {
       case frequency.Second://Error: Cannot implicitly convert type '___.frequency' to 'string'
           //do something
           break;
       case frequency.Minute.ToString()://Error: A constant value is expected
           //do something
           break;
       case frequency.Hour:
           //do something
           break;
       case frequency.Day:
           //do something
           break;
       case frequency.Month:
           //do something
           break;
       case frequency.Year:
           //do something
           break;
   }
}