Use process.start() to automate executing an exe file

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C#

I am trying to Use Process.Start() to automate executing an exe file.

I will first elaborate how to execute the exe file manually:

first, load the exe file by double click it, and after loading, the terminal will show entry info as follows, and the last line, the string 'udec>' is the place to type in commands (please ignore the Chinese characters due to my OS).

--- module2d plugin DFNModule2D loaded.
--- module2d plugin GeometryModule2D loaded.
--- module2d plugin Convert loaded.



                            U D E C: VERSION 7.00
               赏屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯突
               ?     Universal Distinct Element Code       ?
               掏屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯凸
               ?Copyright (c):Itasca Consulting Group 2017 ?
               ?                                           ?
               韧屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯屯图
                Licensee:      Itasca Consulting Group, Inc.
                               Minneapolis, Minnesota  USA
                Options:
                               Barton-Bandis
                               Creep
                               CppUdm
                               Flow
                               Thermal


                Memory:          4096 MBytes
                Precision:     Double
udec>

then I will type in command call 'D:\Work\202205\20220525\tunnel-for-cmd.txt' to execute it, and the result is as follows:

udec>call 'D:\Work\202205\20220525\tunnel-for-cmd.txt'

 ................
 ................
 calculation results
 ................
 ................

What I have tried:

What I am trying is to automate this activity, I use while loop and read from StandardOutput by int v = p.StandardOutput.Read();, and if v == 62 (which means I reached the end of the output, the '>' character), I will then write my command line to standard input. and my code is as follows:  

try
            {
                var psi = new ProcessStartInfo()
                {
                    UseShellExecute = false,
                    FileName = @"D:\Program Files\ITASCA\UDEC700\Exe64\udecConsole2017.exe",
                    //Arguments = @"call 'D:\Work\202205\20220525\tunnel-for-cmd.txt'",
                    RedirectStandardInput = true,
                    RedirectStandardOutput = true,
                    CreateNoWindow = true,
                };
                var p = System.Diagnostics.Process.Start(psi);
                // Read until the udec> prompt
                while (true)
                {
                    //var line = p.StandardOutput.ReadLine();
                    //if (line.StartsWith("udec>"))
                    //    break;
                    int v = p.StandardOutput.Read();
                    Console.Write((char)v);
                    if (v == 62)
                    {
                        break;
                    }
                    if (v == -1)
                        break;
                }

                // Write the command
                Console.Write(@"call 'D:\Work\202205\20220525\tunnel-for-cmd.txt'");
                p.StandardInput.WriteLine(@"call 'D:\Work\202205\20220525\tunnel-for-cmd.txt'");
                p.StandardInput.Flush();

                // Read the result
                string content = p.StandardOutput.ReadToEnd();

                p.WaitForExit();
                Console.WriteLine(content);
               
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

If I run the above code, I will get the starting infomation as expected (shown in the first snippet). Howerver, my simulation of "call 'D:\Work\202205\20220525\tunnel-for-cmd.txt'" fails. Although p.StandardInput.WriteLine() can be executed, when code runs after line 44 (string content = p.StandardOutput.ReadToEnd();), the program got hang up and deadlocked, and does not response so that I can only kill this progam.

I am not sure how to solve it.