how to set default value of combobox in c#

[tanzeel85]

i fill combobox through datasource but at form load i have to show "None" default value of combobox. how i do it??

[Dan Mos]

try setting it's Text property. Being bound you can not add Items programatically but the Text property should work.

[PIEBALDconsult]

Add a "None" item to the collection before you bind it to the control?

modified on Wednesday, April 28, 2010 12:00 PM

[tanzeel85]

items collection can not be modified when the datasource property is set...

[Dan Mos]

not to the comboboxitems. Add "None" to the dataset or whatever underlying collection the combobox is bound to.

[V 0]

Yes you can:

    /// <summary>
    /// Adds an item to the DataSource of the ComboBox.
    /// </summary>
    /// <param name="box">A reference to the combobox.</param>
    /// <param name="displaymember\_value">The value wich should be displayed.</param>
    /// <param name="valuemember\_value">The value behind the displayed item.</param>
    /// <returns>true if succesful otherwise, false.</returns>
    public bool AddItemToComboDataSource(ref ComboBox box, string displaymember\_value, string valuemember\_value)
    {
        bool succes = false;
        try
        {
            DataView view = (DataView)box.DataSource;
            DataRow row = view.Table.Rows\[0\];
            row\[0\] = displaymember\_value;
            row\[1\] = valuemember\_value;
            view.Table.Rows.Add(row);
            box.DataSource = view;
            succes = true;
        }												//end try
        catch (Exception ex)
        {
            errormsg = ex.Message;
        }												//end catch
        return succes;
    }													//end method AddItemToComboDataSource

Which is a little cheating, probably, but it works.

V.