Question

While adding items from one CheckBoxList to another CheckBoxList how to check if the item is already present in the second CheckBoxList using asp.net c#

The code I have written to move between CheckBoxLists is:

protected void add_Click(object sender, EventArgs e)
    {
        for (int i = 0; i <= CheckBoxList2.Items.Count - 1; i++)
        {
            if (CheckBoxList2.Items[i].Selected)
            {
                CheckBoxList3.Items.Add(CheckBoxList2.Items[i]);
                CheckBoxList3.ClearSelection();
            }
        }
    }

I am using add_Click button to move items between lists.
I need to validate while adding items.

Kindly help. Thank you..!!

Answer 1

This will work :-

for (int i = 0; i <= CheckBoxList2.Items.Count - 1; i++)
        {
            if (CheckBoxList2.Items[i].Selected)
            {
                CheckBoxList4.Items.Add(CheckBoxList2.Items[i].ToString().Trim());

            }
        }

foreach (ListItem item in CheckBoxList4.Items)
        {
            if (!CheckBoxList3.Items.Contains(item))
            {
                CheckBoxList3.Items.Add(item);
            }
        }