Question

I am using VS2005 C#.

I am trying to convert my ListBox control to the use of DDL.

However in my function of adding a list of user to a specific role, it enables multiple selection in the ListBox.

I would like to change it to the use of DDL, which only allows single selection.

Below is the code:

    string[] newusers = new string[UsersListBox.GetSelectedIndices().Length];

    for (int i = 0; i < newusers.Length; i++)
    {
        newusers[i] = UsersListBox.Items[UsersListBox.GetSelectedIndices()[i]].Value;
    }

The error pointed out that System.Web.UI.WebControls.DropDownList' does not contain a definition for 'GetSelectedIndices.

May I know what can I alter my code for the use of DDL instead of ListBox?

Answer 1

A DropDownList cannot have multiple items selected, so there is not a GetSelectedIndices() method, as you have noticed. Instead there is a SelectedIndex property.

string newuser = null;
if (UserListBox.SelectedIndex > -1)
{
    newuser = UsersListBox.Items[UsersListBox.SelectedIndex].Value;
}