Here is a short and simple method to get around NETSEAL, commonly used on hackforums for most downloadable applications.

First step: Obfuscate the application with confuser (google it)
Second step: Use NoFuser (also found by using google) to de-confuse the application you just confused (deep)

Now you can view the source of the application with no issues.

NoFuser works only with Confuser v1.8-1.9 with ConfuserEx is not working.

I'm pretty sure Confuser was discontinued awhile ago, ConfuserEx is what everyone uses now.