void updateComboBox() { Comboboxdatas.Clear(); for (int i = 0; i < Variations.Count; i++) { Comboxboxdata cmbdata = new Comboxboxdata() { Number = i + 1 }; Comboboxdatas.Add(cmbdata); } this.ComboBox1.ItemsSource = Comboboxdatas; if (Variations.Count > 1) { this.ComboBox1.SelectedValue = "2"; } else { this.ComboBox1.SelectedValue = "1"; } }