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There's a link in my signature explaining it, or you could look at the many other posts here that use them. But the point is, when posting code, you should surround it with highlight tags to preserve...

When posting code, please use the highlight tags. You can edit your original post to add them.

If that's the line, then it looks like content must be null. When do you declare and instantiate it?

When posting code, please use the highlight tags. Unformatted code is very hard to read.

What line is that Exception occurring on? What are you trying to dereference? What is its value?