assyncrinus invoking method problem

Question

hi..to every boby

iam learning assycronus call methods in c#.net
so i searching through MSDN i got one application copied the code into
my new winform applcation it givving some errros

run this aplication (in C#.net) .............

iam getting some errors.................................

i don't know why they r comming

http://msdn2.microsoft.com/en-us/library/8wy069k1.aspx

so please help me regarding this