How to refresh ComboBox after delete an Item by Clicking On A Button?

 private void button1_click(object sender , EventArgs e)
{
sql connection Conn= new sql connection("Server=. ; DataBase=BooksDB ; Integrated Security =True");
sqlCommand Comm =  new sqlCommand ("Delete From Books Where Author = N'"+cbxAuthor.SelectedValue + "'" , conn);
conn.open();
Comm.ExecuteNonQuery();
MessageBox.Show("Sucess");
conn.Close();
}