Is there no String.Split()?

I might have it wrong but isen't there a split function for strings in C#?
Keep getting an error: "Cannot convert from string to char" when I try to split detailedinfo of a block.
I've looked up different tuts on check if anyone else ran into this issue but could not find anything :S

I'm trying to get the number of how long a battery will get depleted and do something at certain numbers.