Run CMD Function In NAV 2016

Need to develop CMD opertation net use to map network drive from NAV 2016.

Trying to use DotNet variable:

• System.Diagnostics.Process.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
• System.Diagnostics.ProcessStartInfo.'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

MappingCMDString:

net use %1 %2 /user %3 %4 /persistent:yes

The code:

SystemDiagnosticsProcessStartInfo := SystemDiagnosticsProcessStartInfo.ProcessStartInfo('cmd','/c"' + STRSUBSTNO(MappingCMDString,DriveLetter,Path,UserName,Password) + '"');
SystemDiagnosticsProcessStartInfo.RedirectStandardError := TRUE;
SystemDiagnosticsProcessStartInfo.RedirectStandardOutput := TRUE;
SystemDiagnosticsProcessStartInfo.UseShellExecute := FALSE;
SystemDiagnosticsProcessStartInfo.CreateNoWindow := TRUE;
SystemDiagnosticsProcess := SystemDiagnosticsProcess.Start(SystemDiagnosticsProcessStartInfo);
CLEAR(SystemDiagnosticsProcess);

But nothing being processed. Where i did mistake?