Custom Pipelinecomponent and Project/Package Variable

I have custom PipelineComponent written in C# with VS 2012 to send data to Microsoft Dynamics CRM from in-house database as part of ETL.

Has anyone figured out how to read either a package or project variable in custom component?

Script component supports passing of variable and it uses ScriptComponent Class 

I tried 

IDTSVariables100 variables = null;
            VariableDispenser.LockForRead("Package::CrmServiceAddress");
            VariableDispenser.GetVariables(out variables);
            var serviceAddress = variables[0].Value;
            variables.Unlock();
The above code give me an Exception, however if I use "System::ContainerStartTime" it works

Haroon