You can start LinqPad from the command Line with the following command:
runas /netonly /user:prddomain\myuser "C:\path\to\LinqPad.exe"
After you've issued the command you'll be asked for the correct user password. there might be problems, if there are no trust relationships between those 2 domains, but it's worth a try.
The /netonly
parameter lets you run LinqPad(or any other executable) locally as yourself, in your case STGDomain\username
, but remotly you are authenticated as PRDDomain\username
.