The name 'VarPerc' does not exist in the current context

Question

Hello there, thanks for your time.

First of all I must say that I am a newbie when it comes to ASP NET. 

Here is my problem in attachment file.

Your help would be very appreciated.

Compiler Error Message: CS0103: The name 'VarPerc' does not exist in the current context

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1