To sort descending using PowerShell called from C#, you can use the Sort-Object cmdlet in PowerShell. First, create a new ProcessStartInfo object in C# to start a new PowerShell process. Then, pass the PowerShell command to the StandardInput of the process to sort the data in descending order. Finally, read the output of the process to get the sorted data in descending order. Remember to handle any exceptions that may occur during the process.How to pass parameters from C# to PowerShell script.