private void addDisease_btn_Click(object sender, EventArgs e)
{
var disease = new Disease
{
disease = addDisease_txt.Text
};
DiseaseService ds = new DiseaseService();
ds.addDisease(disease);
fillCheckBoxList();
addDisease_txt.Clear();
}
private void fillCheckBoxList()
{
DiseaseService diseasesrvc = new DiseaseService();
var list = diseasesrvc.getAllDiseases();
disease_checklist.DataSource = list;
disease_checklist.ClearSelected();
}