Check If Process Running Then Run

 If you need to start a Process but need only a single instance of it to run you can check if

 the process is running then decide where to run yours or not  

If proc.ProcessName.StartsWith("aprogram.exe") = False Then   

 Try   

   proc.StartInfo.WorkingDirectory = "C:\Program Files\program \aprogram"       roc.StartInfo.FileName = "C:\Program Files\program\aprogram\aprogram.exe "      proc.StartInfo.Arguments = filename & ".CSV"      proc.Start() 

    Catch ex As Exception 

    msgbox(ex.message)  

 End Try 

 End If

 If you are using visual studio and your application is not a console application then 

you could set it as a single  instance application.