[1llusion]

Hi,

well, this isn't my creation, it is from web called: www.vbnet.cz

to find the whole thread click HERE (Note: The Language is Czech)

Okay, so, not much to tell about it... by using mutex, this will detect, if your application is already running or not. Simple as that

Code:

Private appMutex As System.Threading.Mutex Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Form1.Load Dim createdNew As Boolean appMutex = New System.Threading.Mutex(False, "Unique mutex name", createdNew) If Not createdNew Then MessageBox.Show("Application is already running.", Me.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation) Application.Exit() End If End Sub

[Coder-san]

The easier way is to check Make single Instance application in Project Properties.
But Mutex is good for CodeDom outputs and such. Nice share.