Here is a new end to end trading platform DotNet solution company called Modulus Global
http://www.modulusglobal.com/
I got early source code of this platform a few years ago. It is all in .NET
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Update: I got the pricing so reach out privately if interested
NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!