Powershell结果集未在C＃中被提取

When button1 is clicked, the below code is executed which will run a PowerShell script to get the current SQL Server Instances. However when this is run, the result set (results variable) has a count of 0 rows from the PowerShell output. When I run the same code in native PowerShell it displays 3 rows with the instance names.When button1 is clicked, the below code is exec