Mono SQL Query for GtkSharp
very good idea , now i have to read how to construct connection string in mono

Mono SQL Query for GTK# is a GUI client for entering and running SQL commands and scripts. Database objects, such as, tables and table columns can be browsed.

Mono SQL Query is built for Mono 1.0 and GTK# 1.0 or higher. It works on Windows and Linux. It has support for various databases via Mono's ADO.NET implementation and data providers, such as, Npgsql for PostgreSQL access or ByteFX.Data.MySqLClient for MySQL access.

http://forge.novell.com/modules/xfmod/project/?sqlsharpgtk