How to save checkbox item status in Checkedlistbox control in C# windows form application?

I have 2 Checkedlistbox controls in my C# windows form application program. First Checkedlistbox is for doctors’ specialty for example dentist, radiologist and etc. If I check dentist checkbox doctors’ specialty Checkedlistbox control, all doctors who are dentist will be shown in the doctors’ name Checkedlistbox control. The problem is that when I check dentist…