IF, then, Else Functions errors

This may seem like a stupid question but I can't seem to get the IF function to work. I got it to work in an earlier section:

Code:

---

If txtSat1.Text = "" Then
            If txtSat2.Text = "" Then
                If cbSat.CheckState = 0 Then
                    MessageBox.Show("Please Enter Hours for Saturday")
                End If
            End If
        End If

---

but with my current code here:

Code:

---

If txtSun1.Text <> Then
            cbSun.CheckState = 0
            Else If txtSun2.Text <> Then
            cbSun.CheckState = 0
        End If

---

Both the "Then"s are underline blue and it says "expression expected." I have two textboxes and a checkbox. If the user types something into either one of the textboxes, then I want the checkbox to not be able to be clicked. Any help would be appreciated.

Quote:

---

Originally Posted by jhaag4

This may seem like a stupid question but I can't seem to get the IF function to work. I got it to work in an earlier section:
but with my current code here:

Code:

---

If txtSun1.Text <> Then
            cbSun.CheckState = 0
            Else If txtSun2.Text <> Then
            cbSun.CheckState = 0
        End If

---

---

If txtSun1.Text <> (not equal to what?) Then

OH. I thought that <> meant that the textbox.Text has something written in it by the user. Like the opposite of ""

There is no opposite of ""!
<> means literally 'either less than or greater than' and so 'does not equal'. In this case I imagine that what you want is

If txtSun1.Text <> "" Then

The <> is just a nice way of saying both < or >. In other words, not equal to. C-style languages often have a != operator which may make a bit more sense if you know that the ! is the not operator (or at least one of them), so it reads as Not Equal. However, the <> convention is much more common as far as I can tell, as it seems to extend beyond programming.

That was it! Thank you everyone!