Microsoft has been hit with a lawsuit for patent infringment in its .Net development tool.

Vertical Computer Systems has filed suit in Texas alleging that Microsoft has infringed on its US Patent No. 6,826,744, for a "system and method for generating websites in an arbitrary object framework."

The patent covers for Vertical's SiteFlash technology, which uses XML to create a component-based structure to building websites, according to the company's website. A Vertical spokesman could not be reached for comment.

The complaint says Microsoft is still wilfully infringing on the patent despite Vertical having put Microsoft on notice on 7 February. Vertical is asking for a jury trial.

Vertical, based in Fort Worth, Texas, describes itself as a global web services provider. It went public in 2000 but is not listed on a major stock exchange.

A Microsoft representative was not immediately available for comment.