I am working on a project that requires a least 2 i2c devices.
I posted the i2c bus for .Net Micro Framework written in VB and C#.
The class libraries for 24LC256 EEprom devices and SS1306 OLED
devices written in VB and C# are included in the posted project.
The code is here: https://github.com/Dweaver309/i2cBus
I think the code can be easily translated for Tinyclr.