private void _btnRemoveBindings_Click(object sender, EventArgs e) { FormHelper.ValidateIsNotEmpty(_txtRemoveUser.Text, "user"); SendRequest(() => { var request = CreateRegisterRequest(_txtRemoveUser.Text); request.Contacts.Add(SipContactHeader.CreateWildCard()); request.Expires = HeaderFactory.CreateExpiresHeader(0); return(request); }); }