private void BindDropDownList()
    {
        List <tlkpConnect> connect = new List <tlkpConnect>();

        foreach (var item in DataContext.NWODC.tlkpConnects)
        {
            var conOpt = CampaignConnect.Where(a => a.ConnectID == item.ID).SingleOrDefault();
            if (conOpt == null)
            {
                connect.Add(item);
            }
        }
        if (connect.Count != 0)
        {
            ddlConnectionOption.DataSource     = connect;
            ddlConnectionOption.DataTextField  = "Name";
            ddlConnectionOption.DataValueField = "ID";
            ddlConnectionOption.DataBind();
            pnlAddConnection.Visible = true;
        }
        else
        {
            pnlAddConnection.Visible = false;
        }
    }
    protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        string linkID = e.CommandArgument.ToString();

        if (e.CommandName == "Delete")
        {
            CampaignConnect = CampaignConnect.Where(a => a.ModifiedID.ToString() != linkID).ToList();
            BindDropDownAndRepeater();
        }
    }