ComboBox - Losing binding

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s26f84@gmail.com - 24 Oct 2006 22:59 GMT

Hey Guys&Gals

my combo box is never empty it always have the text from the first
member of the table... Plz help

my code:

this.cbo.DataSource = SearchData.Tables["Name"];
this.cbo.ValueMember = "ID";
this.cbo.DisplayMember = "Name";
this.cbo.SelectedIndex = -1;
this.cbo.Text = " ";

Sunny

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Bart Mermuys - 26 Oct 2006 21:25 GMT

Hi,

> Hey Guys&Gals
>
[quoted text clipped - 8 lines]
> this.cbo.SelectedIndex = -1;
> this.cbo.Text = " ";

Once you set a DataSource to the ComboBox, then it's backed by a
CurrencyManager which keeps track of position. A CurrencyManager can't go
to -1 when the list isn't empty, that's what causing the problem.

In NET1.1, you can still force the ComboBox to select -1 if you call
SelectedIndex = -1 twice.

In NET2.0, it can be enough to set it once if ComboBox.FormattingEnabled is
true.

Both will only work at Form_Load (not form constructor).

HTH,
Greetings

> Sunny

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