RadGridView ComboBoxColumn displays no value for member with empty string value is selected

[Alain]

Hi, I am using a RadGridView and have a column that is a GridViewComboBoxColumn.
The ComboBox is bound to a collection of values that are :

ValueMember : DisplayMember
"" : [None]
A : A
B : B
C : C

If the user selects value member A, B or C, all is fine and the associated display member is displayed.
But if the user selects the value member "" (an empty string) the display member [none] is not displayed and the ComboBox displays nothing.  It is like as if when I select an empty string the list will by default go back to selectedIndex = -1.

Here's a code example:

public class ItemComboBox
    {
        public string CleItem { get; set; }
        public string ValeurItem { get; set; }
    }

List<ItemComboBox> liste = new List<ItemComboBox>();
liste.add(new ItemComboBox("", "[None]"));
liste.add(new ItemComboBox("A", "A"));
liste.add(new ItemComboBox("B", "B"));
liste.add(new ItemComboBox("C", "C"));

//cboInsRslCd is my ComboBoxColumn
cboInsRslCd.DataSource = liste;
cboInsRslCd.ValueMember = "CleItem";
cboInsRslCd.DisplayMember = "ValeurItem";

Anyway, to have my [None] display member to be displayed correctly when the empty string value is selected?
Thanks!

[Alain]

I forgot to mention that I am using the CellEditorInitialized event to filter the list of values in the bound list.  I just realized that the problem might be linked to that.  If I disable the CellEditorInitialized event, I can select the member «"", [None]» and the comboBox really displays [None] instead of Nothing.

So, depending on the value of another cell on the same row the cellEditor initializes my combobox with only some of the values of the list that is bound to the combobox.  But whatever the value, the member «"", [None]» is always available in the list.

[Svett]

Hi Alain,

I managed to reproduce the issue and I logged it in our public issue tracking system. It will be addressed in one of the next releases. Meanwhile, you should set the NullValue property of the column to work around it:

cboInsRslCd.NullValue = "[None]";

I updated your Telerik points accordingly.

Regards,
Svett
the Telerik team