When I try to run my .NET project using evaluation version of the Chart Control .NET, I get an Invalid License error.

It means, that you've forgot to copy license file to the proper location near you binary executable. Chart Control .NET is license protected. To avoid license exceptions you should do the following for every project where this control is used:

1. Create License directory in the project’s bin\Debug or/and bin\Release directory.
2. Copy your Manco.Chart.License.lic file to the License directory. (Evaluation license file is located in the Chart_Control_Install_Path\License folder).