asp.net : How to sort items alphabetically in a combobox or dropdownlist ?

Answer 1

you can Sort in the query level itself by order by clause.its good and best practice also, But if you want to sort in the client side here is the function

private void SortDropDown(DropDownList dd) 
{ 
    ListItem[] ar = null; 
    long i = 0; 
    foreach (ListItem li in dd.Items) { 
        Array.Resize(ref ar, i + 1); 
        ar(i) = li; 
        i += 1; 
    } 
    Array ar1 = ar; 

    ar1.Sort(ar1, new ListItemComparer()); 
    dd.Items.Clear(); 
    dd.Items.AddRange(ar1); 
}

Compare class

private class ListItemComparer : IComparer 
{ 

    public int Compare(object x, object y) 
    { 
        ListItem a = x; 
        ListItem b = y; 
        CaseInsensitiveComparer c = new CaseInsensitiveComparer(); 
        return c.Compare(a.Text, b.Text); 
    } 
}