[c#][winforms] keydown event resulterar i störande "beep" ljud.

        private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                List<string> tagList = new List<string>();
                foreach (string chkTag in chkLB_s_tags.CheckedItems)
                {
                    tagList.Add(chkTag.ToUpper());
                }
                string query = build_search_query(textBox1.Text, chkbox_NPC.Checked, chkbox_VPC.Checked, chkbox_BANK.Checked, tagList)
                run_query(query);
                
                    
            }
        }