QUESTION: HOW TO PASS PARAMETERS BETWEEN TWO PROGRAMS??

This is an example caught from csharpfriends.
In this example the App2 should know if from App1 a checkbox has been checked or not.
Here you have the code, I hope it helps you as well as it helped me.

Call the App2 form App1 with

System.Diagnostics.Process.Start("App2.exe","0");

if the checkbox is not checked and

System.Diagnostics.Process.Start("App2.exe","1");

if the checkbox is checked.

From the App2 you can get the argument (0,1) from

using System.Text;
using System.Text.RegularExpressions;

Regex Splits=new Regex(@" ");
string param=Splits.Split(Environment.CommandLine);

if(param.Length>1)
{
param[1]; // is 0 or 1
}