I'm trying to run a batch file in vb.net. This is the command I'm using:
for /r %%a in (.) do (
"C:\Program Files (x86)\IrfanView\i_view32.exe" *.tif /convert=*.png /transpcolor=(255,255,255)
erase /f/q *.tif
You can amend your batch file to refer to the absolute path where the files are located.
for /r %%a in (C:\Folder) do ( ... etc, etc.
Or, you can use a ProcessStartInfo object instead so that your VB.Net application knows which folder to start the processs in as its default folder. Your batch file would then be fine. However, I'd argue that it's better to amend the batch file, as it won't work unless it's run in that specific folder, which you should probably avoid. You could pass the directory to process as a parameter to the batch file.
See here for further info on the WorkingDirectory parameter of the ProcessStartInfo object.
And here for an example (C#, but easily amended to VB.Net): c# ProcessStartInfo