private void addNewDiseaseButton_Click(object sender, EventArgs e)
        {
            DiseaseEntryForm diseaseEntryForm = new DiseaseEntryForm();

            Close();
            diseaseEntryForm.Show();
        }
 private void addNewDiseaseButton_Click(object sender, EventArgs e)
 {
     DiseaseEntryForm diseaseEntryForm=new DiseaseEntryForm();
     diseaseEntryForm.Show();
 }