[Solved] After inserting a value from an array, the second part of the string disappears without a trace, how to insert it correctly?

Question

Programming

Good day. Trimmed (the substring " RIN="+ value
" disappears without a trace from the startInfo.Arguments string, while in the absence of ED, RIN and value appear.

string ED = WL[NW.SelectedIndex][0];
foreach (string value in WD.Lines) {
startInfo.Arguments = "MainD=IDD ID="+ ED +" RIN="+ value;
}

UPD
ConsoleProgram.exe VPN Action=pptp SIP=19216801 KEY=123456
When you run the program with these arguments, using cmd everything starts and works as it should. There are no errors in the launch line, there are no "-" and "/" signs either.
I'm learning C#, I'm writing test software for practice purposes, please don't kick too much.
UPD Solved the problem, removed unreadable (\n\r\t) characters from the string, everything works like clockwork.

Answer 1

I don't see the argument names, which are usually specified using "-" or "/".
Perhaps it should be:
startInfo.Arguments = "-MainD IDD -ID "+ ED +" -RIN "+ value;
If this is a single argument, then you need to remember that spaces are considered separators between multiple arguments and a single argument that includes spaces must be enclosed in quotes, which we do not forget to escape:
startInfo.Arguments = "-someKey \"MainD=IDD ID="+ ED +" RIN="+ value + "\"";