Excel VBA Forms Error Message loop - vba

Question

i currently have a problem with a simple login form in excel (VBA), when having an error, continuing and having another error it still gives me two more MsgBoxes with errors but with the "Unload Me" and "Goto Ende" it should close itself completely.
Any guesses why this isn't working? I know this is very basic and probably very redundant, but it should still work.
Public Name As Variant
Public Password As Variant
Private Sub Btn_Register_Cancel_Click()
Unload Me
End Sub
Private Sub Btn_Register_Register_Click()
Start:
Dim Error As Integer
Error = 0
Name = Tbx_Register_Name.Value
Password = Tbx_Register_Password.Value
'Check for Name, Password, Password2 if empty
If Tbx_Register_Name.Value = "" Then
Error = MsgBox("Please enter a username.", _
vbRetryCancel, "Error")
If Error = 2 Then
Unload Me
GoTo Ende
Else
Application.ScreenUpdating = False
Register.Hide
Register.Show
Application.ScreenUpdating = True
GoTo Start
End If
ElseIf Tbx_Register_Password.Value = "" Then
Error = MsgBox("Please enter a password.", _
vbRetryCancel, "Error")
If Error = 2 Then
Unload Me
GoTo Ende
Else
Application.ScreenUpdating = False
Register.Hide
Register.Show
Application.ScreenUpdating = True
GoTo Start
End If
ElseIf Tbx_Register_Password2.Value = "" Then
Error = MsgBox("This field cannot be empty.", _
vbRetryCancel, "Error")
If Error = 2 Then
Unload Me
GoTo Ende
Else
Application.ScreenUpdating = False
Register.Hide
Register.Show
Application.ScreenUpdating = True
GoTo Start
End If
End If
With Workbooks("General Makro.xlsx").Worksheets("User")
'Check for Username match in registration list
For i = 1 To 100
If .Cells(i, 1).Value = Name Then
Error = MsgBox("This username is already taken.", _
vbRetryCancel, "Error")
If Error = 2 Then
Unload Me
i = 100
GoTo Ende
Else
Application.ScreenUpdating = False
Register.Hide
Register.Show
Application.ScreenUpdating = True
GoTo Start
End If
End If
Next i
End With
'Check for the passwords to match
If Tbx_Register_Password.Value = Tbx_Register_Password2.Value Then
With Workbooks("General Makro.xlsx").Worksheets("User")
For i = 1 To 100
If .Cells(i, 1) = "" Then
.Cells(i, 1).Value = Name
.Cells(i, 2).Value = Password
Tbx_Register_Password.Value = ""
Tbx_Register_Password2.Value = ""
Application.ScreenUpdating = False
Register.Hide
Login.Show
Tbx_Login_Name.Value = .Cells(i, 1).Value
Tbx_Login_Password.Value = .Cells(i, 2).Value
Application.ScreenUpdating = True
i = 100
GoTo Ende
End If
Next i
End With
Else
Error = MsgBox("The passwords have to match!", vbRetryCancel, "Error")
If Error = 2 Then
Unload Me
GoTo Ende
Else
Application.ScreenUpdating = False
Register.Hide
Register.Show
Application.ScreenUpdating = True
GoTo Start
End If
End If
Ende:
End Sub
Edit: I Actually Tried to do the 2nd UserForm for the login, and i happen to get the same problem there. Everything works just fine, until i close the whole program, then the error-message appears again. Am i unloading the userform incorrect? Maby the login userform says open and continues when everything is getting closed.
Edit 2: I could just turn off alerts but that would be an ugly solution and definitely nothing i want to implement on every close button in the program.

Answer 1

You can verify blank values in textboxes with this:
If TextBox.Text = "" Then
MsgBox "Is blank!"
Unload Me
GoTo Ende
End If
'Your code
Ende: Exit Sub
To verify the username and password in a database, you can do this:
Dim sh As Worksheet
Dim LastRow As Long
Dim UserRange As Range
Dim UserMatch As Range
Set sh = ThisWorkbook.Sheets("database")
LastRow = sh.Range("A" & Rows.Count).End(xlUp).Row
Set UserRange = sh.Range("A1:A" & LastRow)
Set UserMatch = UserRange.Find(What:=UserTextBox.Text, LookIn:=xlValues)
If Not UserMatch Is Nothing Then
MsgBox "User exists!"
If PwdTextBox.Text = UserMatch.Offset(0, 1) Then
MsgBox "Pwd matched!"
'do something
Else
MsgBox "Wrong password!"
'do something
End If
Else
MsgBox "User dont exists!"
'do something
End If
This will work if in the database the usernames are in column A and the passwords in column B.