[help] if else elseif logic problem.

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VB

I have a problem at this point. My aim is that when the svb.text="Update" it should update the data.. heres my code

If t8.Text < DateTime.Now.ToString("MMMM dd,yyyy") Then
            MsgBox("You cannot assign the burial date because it was already elapsed", MsgBoxStyle.Information, "Cannot be")
            t8.Text = DateTime.Now.ToString("MMMM dd,yyyy")
End If

If CheckBox1.Checked = True Then
     If svb.Text = "SAVE" Then
            If t1.Text.Length = 0 Or t2.Text.Length = 0 Or t3.Text.Length = 0 Or t4.Text.Length = 0 Or _
               t5.Text.Length = 0 Or t6.Text.Length = 0 Or t7.Text.Length = 0 Or t8.Text.Length = 0 Or _
               t9.Text.Length = 0 Or t10.Text.Length = 0 Or t11.Text.Length = 0 Then
                    MsgBox("You cannot add null values", MsgBoxStyle.Information, "Null")
                    Refresh()
            Else
                    roomIsAvailable1()
            End If

     ElseIf svb.Text = "Update" Then
         roomIsAvailable2()
     End If

ElseIf CheckBox1.Checked = False Then
            MsgBox("Reservation cannot be added because the required documents are not present, please check the checkbox if it is already presented", MsgBoxStyle.Exclamation, "Documents not presented")
End If

t8.text is a datetimepicker where if the date is lesser than the recent date, it will show a msgbox.
svb is the button

What I have tried:

Before, it worked but this time.. nothing happens...