Win.CodeNavi.frmMain.txtExt_TextChanged C# (CSharp) Method

        private void txtExt_TextChanged(object sender, EventArgs e)
        {
            if (txtExt.Items.Contains(txtExt.Text))
            {
                cmdRemember.Enabled = false;
                cmdForget.Enabled = true;
            }
            else
            {
                cmdRemember.Enabled = true;
                cmdForget.Enabled = false;
            }
        }