Hi and welcome to LinuxQuestions!
What is the error you received? Usually Microsoft.NET framework is installed by means of winetricks
sh winetricks corefonts dotnet20
to install version 2.0.
Microsoft.NET support is rated GOLD
till release 2.0. Some difficulty may arise for newer versions. Someone reported some problems in installing the 64-bit version of release 2.0, too (whereas 32-bit version works fine). Hope this helps.