Error loading file

[rgrant-hash]

When running the following code, receive the error "Error loading \?\C:\Temp\RGrant Data\Basic learning project-print-to-defaultC:\Oasis Reports\Display John Doe Options.pdf"
It appears to add the location of the C# program that is calling SumartraPDF. The C# code being used is:
//
// Print the pdf file to the default printer
//
string pdfFilePath = "C:/Oasis Reports/Display " + textBox1.Text + " Options.pdf";
string arguments = $"-print-to-default"{pdfFilePath}" -exit-when-done";
ProcessStartInfo startInfo = new ProcessStartInfo
{

                FileName = @"C:\SumatraPDF\SumatraPDF.exe",
                Arguments = arguments,
                CreateNoWindow = true,
                UseShellExecute = true
            };
            System.Diagnostics.Process.Start(startInfo);

I also am attempting to have the pdf document printed without the user seeing the SumartraPDF window, but it appears.

[GitHubRulesOK]

your approach is wrong the simplest way is use a command line file (.cmd or .bat) as c# will mess the process up the way your calling.

Firstly CMD prove that

"C:\SumatraPDF\SumatraPDF.exe" (with a space before args) -print-to-default (with a space before filename) works

your not spacing a CMD call well and don't need anything more that "exit" is likely to look for a second filename as it indicates user dialog printing
something like

string pdfFilePath = "C:\\Oasis Reports\\Display " + textBox1.Text + " Options.pdf";
string arguments = "-print-to-default \"" + pdfFilePath;

[GitHubRulesOK]

write a small test as a CMD file run it and it writes an exe run that it asks for user input and sends the command but for test it is just console

/*&cls
rem After console tests OPTIONALLY remove (1 and 3) X Console.WriteLine from CS code
rem  UN-comment last line and change this CMD to save as a WinExe e.g.
rem C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /nologo /target:winexe /platform:x86  %~0"
C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /nologo /platform:x86  %~0"
@pause & exit /b 
*/
using System; using System.Windows.Forms;using System.Diagnostics;
public class MainForm : Form
{
    private TextBox input;
    private Button send;
    [STAThread]
    public static void Main()
    {
        Console.WriteLine("WinForm + Console hybrid started.");
        Application.EnableVisualStyles();
        Application.Run(new MainForm());
    }
    public MainForm()
    {
        this.Text = "Test";
        this.Width = 200; this.Height = 100;
        this.FormBorderStyle = FormBorderStyle.FixedDialog;
        this.MaximizeBox = false;
        input = new TextBox(); input.Left = 10; input.Top = 10; input.Width = 160;
        send = new Button(); send.Text = "Send"; send.Left = 10; send.Top = 40; send.Width = 160;
        send.Click += Send_Click;
        this.Controls.Add(input);
        this.Controls.Add(send);
    }
    private void Send_Click(object sender, EventArgs e)
    {
    string sumatra = @"C:\SumatraPDF\SumatraPDF.exe";				// Path to SumatraPDF
    string flags = " -print-to-default " + " -print-settings \"paper=A4\" ";	// Build flags (quotes protected)
    string pdfFilePath = @"C:\Oasis Reports\Display "+ input.Text +" Options.pdf";	// Build the target path
    string targetFile = "\"" + pdfFilePath + "\"";				// Protect the filename
    // DEBUG OUTPUT (shows for cmd.exe added quotes around the exe)
    Console.WriteLine("FULL COMMAND (for prooftesting, copy and paste as a WINDOWS console CMD):");
    Console.WriteLine("\"" + sumatra + "\" " + flags + " " + targetFile);
    Console.WriteLine();
    // ACTUAL PROCESS EXECUTION
    ProcessStartInfo startInfo = new ProcessStartInfo {
        FileName = sumatra,
        Arguments = flags + " " + targetFile,
        CreateNoWindow = true,
        UseShellExecute = false,
        WindowStyle = ProcessWindowStyle.Hidden
    };
    // RUN VISUAL CONSOLE TEST LINE (copy and paste as a CMD) BEFORE processing via:
    // System.Diagnostics.Process.Start(startInfo);
    }
}

The reason you never try to hide SYSTEM feedback is in many machines the default printer is the FAX printer, and you need that to be seen as not a desired printer.

[kjk]

Your program is providing incorrect path: \?\C:\Temp\RGrant Data\Basic learning project-print-to-defaultC:\Oasis Reports\Display John Doe Options.pdf