vb.net textbox marker that detects the empty textbox

I want to make a project that will detect which textbox is empty and not

If txtInterviewee.Text = String.Empty Or txtInterviewed.Text = String.Empty Or txtValidated.Text = String.Empty Or _
             txtResidence.Text = String.Empty Or dtpValidated.Text = String.Empty Or txtLastName.Text = String.Empty Or _
             txtFirstName.Text = String.Empty Or txtMiddleName.Text = String.Empty Or txtAddress.Text = String.Empty Or _
             cmbGender.Text = String.Empty Or cmbCivilStatus.Text = String.Empty Or dtpBirthDay.Text = String.Empty Or _
             txtBirthPlace.Text = String.Empty Or txtCitizenship.Text = String.Empty Then
            MsgBox("Must fill the following Fields")
        End If

if any of the textbox is empty I want it to be marked or something so the user will know which textbox needs to be filled.