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Using .NET Classes in PowerShell

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Error

New-Object : A constructor was not found. Cannot find an appropriate constructor for type System.Net.WebRequest. At line:1 char:7 + $wr = New-Object -TypeName System.Net.WebRequest + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : ObjectNotFound: (:) [New-Object], PSArgumentException + FullyQualifiedErrorId : CannotFindAppropriateCtor,Microsoft.PowerShell.Commands.NewObjectCommand

The error message is clear, now it's time to look into the Microsoft documentation. Reference Link

Remarks

Use the Create method to initialize new WebRequest instances.

Do not use the constructor.

Example C#

WebRequest myRequest = WebRequest.Create("http://www.contoso.com");

PowerShell Code

$wr = [System.Net.WebRequest]::Create('http://technet.microsoft.com')
$wr | GM
$wr = [System.Net.WebRequest]::Create('http://technet.microsoft.com')
$wr.ReadWriteTimeout