How to fix C# Process code for error messages

A CMD script was created through StreamWriter. I then used the Process.start() method to run the CMD script.

In business logic, you invoke methods through infinite loops to create and execute scripts.

Because we have a task that needs to be checked constantly, we used a while loop.

However, an error has occurred:

"0x00000000 referenced memory, memory can not be read."

I searched through Google, but I do not know why this happens.

Problem code...

public void PrintPDFTest()
{

    string PRINT_NAME = CGlobalValueables.Instance.PropPrintName;
    const string PRINT_PDF = "PrintPDF.cmd";

    if (IsCheckSelectFile() == false)
    return;

string filePDFProgramPath = _selectFile[1].ToString();

File.Create("PrintPDF.cmd").Dispose();

using (StreamWriter file = new StreamWriter(PRINT_PDF, false, Encoding.Default))
{
    file.WriteLine("c:");
    file.WriteLine(@"cd C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader");
    file.WriteLine(string.Format("AcroRd32.exe /t \"{0}\" \"{1}\" \"\" \"\"", filePDFProgramPath, PRINT_NAME));
}

    ProcessStartInfo startInfo = new ProcessStartInfo
    {
        CreateNoWindow = true,
        RedirectStandardError = true,
        UseShellExecute = false,
        FileName = PRINT_PDF,
        WindowStyle = ProcessWindowStyle.Hidden
    };

   Process.Start(startInfo); // error
}