Question

I am making a application(desktop app), and need to fetch ids from DB and pass these ids to another desktop application.

How to achieve this?

Answer 1

Your question is your answer. You can use command line argument passing in windows application. As to how to do this is written below.
You can Create a process and call the application to start and pass those arguments:

Process pro=new Process();
pro.StartInfo.FileName = @"ApplicationName.exe";
pro.StartInfo.Arguments = arg1 + " " + arg2;
pro.Start();

pro.WaitForExit();

in the second application get these values by following the below code:

var arguments = Environment.GetCommandLineArgs();
if (arguments.Length > 1)
{
productIdFirst = Convert.ToInt32(arguments[1]);
productIdSecond = Convert.ToInt32(arguments[2]);
}