SQL Power Injector is a graphical application created in C# .Net 1.1 that helps the penetration tester to inject SQL commands on a web page. Its main strength is its capacity to automate tedious blind SQL injection with several threads. Released under the Clarified Artistic License.
You can download it from the following link: https://packetstormsecurity.com/files/download/57781/SQLPowerInjectorSourceCodev1.2.rar
Source: https://packetstormsecurity.com/files/57781/SQLPowerInjectorSourceCodev1.2.rar.html