1 is not a supported code page. parameter name: codepage

[TheIronLefty]

i had this issue when starting a new project, however it was remedied by changing my regional format back to English US, not sure whats the cause.

[kterhorst]

Same here. Very annoying.

[IvanEfimov]

This is because the engine parses values assuming that English localization is enabled. It is necessary to specify localization in each call, or use another solution if it possible.
And all ToString() calls. class SimpleTypes, etc.

[IvanEfimov]

Who knows elegant solution?