I've worked with C# for 14 years (since .net 2.0), with asp for 10 (since v4). Also very experienced in all MS-stack technologies (SQL Server, Xamarin, Azure). I've used it to develop all kinds of services, from integration with SMSC and MMSC services of major GSM providers through design and implementation of distributed, parallel systems to programming and administration of MS SQL databases.
From the software engineering point of view - I've got extensive experience in software creation process, including analysis, architecture, time evaluation and supervision of development.