vb.net - Convert filename in a folder from upper case to lower case (Windows Command Prompt or PowerShell) -

i have 600 files in folder need convert form lower case upper case. cannot install apps in machine since our won't allow it, hence, either have in powershell, cmd or maybe vb.

example file:

dog_123.csv needs converted dog_123.csv

thanks in advance.

in powershell:

get-childitem | rename-item -newname { $_.basename.toupper() + $_.extension } 

or shorter:

ls | ren -n { $_.basename.toupper() + $_.extension }