Set environment variables for a process

Question

What is the environment variable concept?

In a C# program I need to call an executable. The executable will call some other executables that reside in the same folde

Answer 1

What is your problem actually? System.Environment.SetEnvironmentVariable changes the environment variables of the current process. If you want to change the variables of a process you create, just use the EnvironmentVariables dictionary property:

var startInfo = new ProcessStartInfo();

// Sets RAYPATH variable to "test"
// The new process will have RAYPATH variable created with "test" value
// All environment variables of the created process are inherited from the
// current process
startInfo.EnvironmentVariables["RAYPATH"] = "test";

// Required for EnvironmentVariables to be set
startInfo.UseShellExecute = false;

// Sets some executable name
// The executable will be search in directories that are specified
// in the PATH variable of the current process
startInfo.FileName = "cmd.exe";

// Starts process
Process.Start(startInfo);