Extract file with 7zip not working

I am trying to extract a file using 7zip by starting a process and passing the parameters in the arguments I cant get it to unzip. does anyone know how to do this?
Thanks
string tempfile = localpath + "\\MyFile.7z";
                    fts.DownloadMasterStickFTPFile(tempfile, "MyFile.7z");    //download the file to temp

                    FileInfo tempfi = new FileInfo(tempfile);

                        string currentFileName = tempfi.FullName;
                        var processStartInfo = new ProcessStartInfo();
                        processStartInfo.FileName = @"C:\Program Files\7-Zip\7z.exe";
                        processStartInfo.Arguments = "x " + localpath + "\\MyFile.7z ";
                        processStartInfo.UseShellExecute = false;
                        Process.Start(processStartInfo);

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r3nderAsked:
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r3nderAuthor Commented:
shellI am getting this now - how do I pass the argument to just do it
Robert SchuttSoftware EngineerCommented:
I only have an old version I think but the help file says:
-y (assume Yes on all queries) switch
Disables most of the normal user queries during 7-Zip execution. You can use this switch to suppress overwrite queries in the e (Extract) and x (Extract with full paths) commands.

Syntax
-y

Examples
7z x src.zip -y

extracts all files from src.zip archive. All overwrite queries will be suppressed and files on disk with same filenames as in archive will be overwritten.

Commands that can be used with this switch
e (Extract), x (Extract with full paths)
So can you try changing this line, add "-y" option at the end:
processStartInfo.Arguments = "x " + localpath + "\\MyFile.7z -y ";

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käµfm³d 👽Commented:
** No Points **

Robert Schutt is correct:  This option exists even in 9.20:

Screenshot
r3nderAuthor Commented:
Thanks all
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