.net functions of an exe used in excel. how to use some of the variables of the exe which may change in other functions or on load?

I am using some of the functions of .net applica开发者_高级运维tion in excel through COM. But whenever i call some function of the .net, i need to open exe and send some values to the form of the exe and use some of the values from the running exe. How do i do this? please help..

Use WCF as intermediatary between excel and .net , it works like charm..