N'August 2000, Microsoft, Hewlett-Packard, na Intel rụrụ ọrụ iji mee ka Common Language Infrastructure (CLI) na C #. Ka ọ na-erule December 2001, ha abụọ kwadoro ụkpụrụ Ecma International (ECMA) International Organization for Standardization (ISO) gbasoro na Eprel 2003. Ụdị nke ISO ugbu a bụ ISO / IEC 23271: 2012 na ISO / IEC 23270: 2006. Ọ bụ ezie na Microsoft na ndị mmekọ ha nwere patent maka CLI na C #, ECMA na ISO chọrọ ka a na-enweta ihe niile dị mkpa maka mmejuputa iwu na "okwu ndị ezi uche dị na nke na-abụghị ịkpa ókè". Ụlọ ọrụ ndị ahụ kwetara izute okwu ndị a, ma mee ka ndị patent dị maka n'efu. Otú ọ dị, nke a emeghị maka akụkụ nke.NET nke ECMA-ISO na-ekpuchighị, nke gụnyere AD For Windows, BC.NET, na Microsoft Patents. ASP.NET. Ndị na-esote n'April 2003.
ịhazi Common Language Infrastructure (CLI) na C#