Question

Im using c# .net windows form application. I have a database with some tables.I have two comboboxes (A & B). I have populated a combo box A with column names of a table using sys.columns. Now when i select an item in combo box A ,combo box B should be populated with the same items except the selected item which was selected in combobox A .

Answer 1

You should delete either this question or this one which are about identical things. anyway, here is my identical answer:

in the selected item changed event of A, add code which clears B, then loops round each item in A’s Item collection and adds it to B as long as the index of the current item is different from the index of the SelectedItem in A.

Something like (pseudo code, not tested)

b.Items.Clear;
for(int i=0; i<A.Items.Count; i++)
{
    if (i!=A.SelectedItemIndex)
    {
    b.Items.Add(A.Items[i]);
    } 
}

or

B.Items.Clear;
foreach(object o in A.Items)
{
     b.Items.Add(o);
}
b.Items.Remove(A.SelectedItem);

should do it as well.