Question

The problem is strange, I have a combobox which is correctly filled with items through the DataSource properties (it binds to a bindingSource item, which contains a displaymember and a valuemember), this is a simple combobox which allows me to select suppliers by choosing between their names and not their ids.
The problem is that when I change SelectedValue because I want an option set as the default one, I discovered that the List property is empty (I inherited the combobox class in another one), However when the combobox is shown, I have items inside it, so maybe the problem is related to WHEN data is really loaded from the datasource (maybe it’s loaded only after displaying it?). When should I change my SelectedValue so?There isn’t any “Shown” event in the control

Thanks for any suggestions

Update 1:
I tested in your way but it’s not this the case (the key is a long but even if I cast it it’s not working), in fact the interesting thing is that I have a setter that allows me to set SelectedValue, even if doesn’t throw exceptions, in the next MessageBox the Items.Count give me 0 as value, which is very strange, because when the combobox is shown on the form it has all values i wanted. Here is the code for my setter:

    public object InputValue
    {
        get
        {
            return SelectedValue;
        }
        set
        { 
            SelectedValue = ((long)value);
            MessageBox.Show(this.Items.Count.ToString());
        }
    }

Answer 1

I solved the problem, in fact as I thought the Items collection is filled “around” first invalidation of the combobox, so I simply stored the value submitted in as SelectedValue before the first invalidation in a temporary variable and then I just set it under the Invalidated event.