Please don’t post images of code, use code-tags .
Your code is just plain wrong (in many ways) beyond the error you stated above. I suggest looking up some basic C# syntax tutorials. The fact that you seem to be dealing with networking without this basic knowledge is scary so I would certainly save yourself some pain and go over these for starters. 
Line 11 : I guess you meant “return;” (C# is case-sensitive)
Line 13/14 : I guess you meant to use “*” to indicate “multiply” between the input/time/constants