Task Timing Application

I was studying for an exam this Friday night, and out of a sudden it struck me. At my current (former) job we have to do timing on our activities and i never considered of doing an application that would facilitate this.
So.. this is how it began..
Today is Sunday, i think i have done about 80% percent of the project, but when i still see things that i can do with it the finish point still looks a little bit far.
Anyway the problem i ran into today was regarding Serialization in C#.
I want to have 2 applications : one will export data using Serialization into a binary file, that i want to open with another application. Simple i said. But the fact is when trying to open it thorough the other application, i received an error : "Unable to find assembly 'Application Timing', Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

I began searching on forums and here is what i found :

• A post in the CodeProject forum where i am a member;
• An interesting site explicitly with serialization;

After i will make my implementation i will post it here and the final app plus source code, hopefully soon :)