C#

/// <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

faslesabz wrote:

You should perhaps do some reading on COM interop.