by Tyler Badger (1 Submission)
Category: Coding Standards
Compatability: Visual Basic 5.0
Difficulty: Beginner
Date Added: Wed 3rd February 2021
Rating: 
(5 Votes)
This simple few lines of code will give the user and error message if they are already running your program. Doesn't apply if you are in the ide!
VBcodersPrivate Sub Form_Load() ' the form1 loading sub
If App.PrevInstance Then ' check if running
MsgBox "Error:" & vbCrLf & "Please switch to your already running app." ' error message
Dim frm As Form ' set frm variable as a form
For Each frm In Forms ' get all forms
Unload frm ' unload the form
Set frm = Nothing ' set frm variable as nothing
Next frm ' go to the for each frm again
End If ' end the if statement
End Sub ' end the form load
