var proc = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = PowerShellExe,
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true,
                    CreateNoWindow = true,
                    WorkingDirectory = workingDirectory,
                    Arguments = string.Concat(string.Format(@" -File ""{0}"" ", fullPathToFile), commandLineArguments)
                },
                EnableRaisingEvents = true
            };

<rabbitMQ messageBusURI="rabbitmq://localhost/" messageBusUserName="guest" messageBusPassword="guest" purgeOnStartup="true" timeout="00:00:30" />

<rabbitMQ messageBusURI=rabbitmq://localhost messageBusUserName=guest messageBusPassword=guest purgeOnStartup=false timeout=00:00:30 />

param(
    [string]$FilePath = $Args[0],
    [string]$RegEx = $Args[1],
    [string]$ReplacementValue = $Args[2]
)

cls

(get-content $FilePath) | foreach-object {$_ -replace $RegEx,$ReplacementValue} | set-content $FilePath

" -FilePath "MyService.exe.config"  -RegEx "<rabbitMQ messageBusURI=[^\>]*>"  -ReplacementValue "<rabbitMQ messageBusURI="rabbitmq://localhost" messageBusUserName="guest" messageBusPassword="guest" purgeOnStartup="false" timeout="00:00:30" />" "