How can i merge two Programs in a one solution in c#.net ?

i need to call a program to run, from the main program in the same solution. pls tell me how to do that in step-by-step..

How can i merge two Programs in a one solution in c#.net ?
if it is exe that u didnt develop you can only call shell


but if its a project file u can merge it with add --%26gt; existing file





but as i said before if its an exe you can only call it like that





process.start("path");