ApiKey property
Use this property to set and retrieve your Eyes license key.
To obtain your API key, see How to obtain your API key.
Syntax
string value; // give relevant initial value
eyes.ApiKey = value;
value = eyes.ApiKey
Type:string
Remarks
Set this immediately after the Eyes object is created (before calling Open).
If you have an environment variable called APPLITOOLS_API_KEY that is set to the value
of your API key, then you do not need to call this method, and Eyes will take the string from the environment value.