I always looking for free web gis server with dotnet framework capabilities. Mostly everything that related with dotnet came with a charge. Recently i found that autodesk start their web gis opensource project, the MapGuide Open Source Project (MGOS). Surely it can run on dotnet framework and it’s free.
MapGuide Open Source is a web-based platform that enables users to quickly develop and deploy web mapping applications and geospatial web services. MapGuide features an interactive viewer that includes support for feature selection, property inspection, map tips, and operations such as buffer, select within, and measure. MapGuide includes an XML database for managing content, and supports most popular geospatial file formats, databases, and standards. MapGuide can be deployed on Linux or Windows, supports Apache and IIS web servers, and offers extensive PHP, .NET, Java, and JavaScript APIs for application development. MapGuide Open Source is licensed under the LGPL..