Nullable ComboBox.SelectedValue

Here's what I hacked out of the nullable DateTimePicker to work for the SelectedValue property of a ComboBox

        /// <summary>
        /// From BReusable
        /// </summary>
        /// <param name="comboBox"></param>
        /// <param name="dataSource"></param>
        /// <param name="valueMember"></param>

        /// <remarks>With help from Dan Hanan at http://blogs.interknowlogy.com/danhanan/archive/2007/01/21/10847.aspx</remarks>

        public static void BindNullableSelectedValue(this ComboBox comboBox, BindingSource dataSource, String valueMember)

        {

            var binding = new Binding(Member.Name<ComboBox>(item=>item.SelectedValue), dataSource, valueMember, true);



            //OBJECT PROPERTY --> CONTROL VALUE

            binding.Format += ((sender, e) =>

            {

                Binding b = sender as Binding;



                if (b != null)

                {

                    var  cBox = (binding.Control as ComboBox);

                    if (cBox != null)

                    {

                        if (e.Value == null)

                        {



                            cBox.SelectedItem=null;



                        }

                    }



                }

            });

            // CONTROL VALUE --> OBJECT PROPERTY

            binding.Parse += ((sender, e) =>

            {

                // e.value is the formatted value coming from the control.
                // we change it to be the value we want to stuff in the object.

                var b = sender as Binding;



                if (b != null)

                {

                    var cBox = (b.Control as ComboBox);

                    if (cBox != null)

                    {

                        e.Value = cBox.SelectedItem != null ? cBox.SelectedValue : null;

                    }

                }

            });

            comboBox.DataBindings.Add(binding);



        }

- Formatted via Jeff Atwood's - ModernText Visual Studio Macro