Sharpdevelop reports from PostgreSQL database.

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PostgreSQL

reporting

I am relatively new to Sharpdevelop (4.2), but for my project I have to use this.
I have a Windows Forms application, that that used together with a database in PostgreSQL (9.1), the connection is made using npgsql.

I got to the part where I have to make reporting possible from data, that is first taken from the database and then modified (some columns are not stored but have to be calculated).

In Sharpdevelop there is something called Sharpdevelop Reports, but that supports only MS SQL Server, and I could not add postgresql to the Database Explorer either.

I am not so good at programming, I could manage this far, but I am really stuck here.
Please tell me or provide some instructions on how could I make reports?