ComboBox SelectedValue property doesn't work

Question

I'm trying to add objects into a combobox and use SelectedValue property to select and item in the combobox but it does not work: SelectedValue is still null after the assignment.

 class ComboBoxItem
 {
 string name;
 object value;
 public string Name { get { return name; } }
 public object Value { get { return value; } }
 public ComboBoxItem(string name, object value)
 {
 this.name = name;
 this.value = value;
 }
 public override bool Equals(object obj)
 {
 ComboBoxItem item = obj as ComboBoxItem;
 return item!=null && Value.Equals(item.Value);
 }
 } 
 operatorComboBox.Items.Add(new ComboBoxItem("Gleich", SearchOperator.OpEquals));
 operatorComboBox.Items.Add(new ComboBoxItem("Ungleich", SearchOperator.OpNotEquals));
 operatorComboBox.ValueMember="Value";
 //SelectedValue is still null after this statement
 operatorComboBox.SelectedValue = SearchOperator.OpNotEquals; 

Answer 1

ValueMember is only applicable when databinding via DataSource property, not when you add items manually with Items.Add. Try this:

var items = new List<ComboBoxItem>();
items.Add(new ComboBoxItem(...));
operatorComboBox.DataSource = items;

Btw, note that when you override Equals, you should also override and implement GetHashCode.