in my Method RecalcChartAsync i do some time intensive stuff.. so i thought i\'ll do some things async.
RecalcChartAsync
I want to start the two Methods CreateHist
CreateHist
There is nothing you're awaiting on within your methods, so marking then as async is pointless. That's why ReSharper is warning you.
async
You should start from learning how async/await works: http://msdn.microsoft.com/en-us/library/vstudio/hh191443.aspx
await