title: Powershell with c# System.Collections.Generic.dll could not be found
body: <p>I try to write a powershell script with c# code. Script code</p>
  
  <pre><code>$code = @"
      using System;
      using System.Collections.Generic;
      using System.IO;
      using System.Linq;
      using System.Xml.Linq;
      using System.Runtime.InteropServices;
      using System.Text.RegularExpressions;
  "@
  
  
  [Reflection.Assembly]::LoadWithPartialName("System") 
  [Reflection.Assembly]::LoadWithPartialName("System.Collections.Generic") 
  [Reflection.Assembly]::LoadWithPartialName("System.IO") 
  [Reflection.Assembly]::LoadWithPartialName("System.Linq") 
  [Reflection.Assembly]::LoadWithPartialName("System.Xml.Linq") 
  [Reflection.Assembly]::LoadWithPartialName("System.Runtime.InteropServices") 
  [Reflection.Assembly]::LoadWithPartialName("System.Text.RegularExpressions") 
  
  $refs = @("System", "System.Collections.Generic", "System.IO", "System.Linq", "System.Xml.Linq", "System.Runtime.InteropServices", "System.Text.RegularExpressions")
  
  Add-Type -ReferencedAssemblies $refs -TypeDefinition $code
  </code></pre>
  
  <p>When i exucute my script, i've got the error</p>
  
  <pre><code>GAC    Version        Location                                                                                                                                                                
  ---    -------        --------                                                                                                                                                                
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll                                                                             
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.IO\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.IO.dll                                                                       
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Linq\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Linq.dll                                                                   
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll                                                           
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.InteropServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Runtime.InteropServices.dll                             
  True   v4.0.30319     C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Text.RegularExpressions\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Text.RegularExpressions.dll                             
  Add-Type : (0) : Metadata file 'System.Collections.Generic.dll' could not be found
  (1) :     using System;
  At line:22 char:1
  + Add-Type -ReferencedAssemblies $refs -TypeDefinition $code
  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : InvalidData: (error CS0006: M...ld not be found:CompilerError) [Add-Type], Exception
      + FullyQualifiedErrorId : SOURCE_CODE_ERROR,Microsoft.PowerShell.Commands.AddTypeCommand
  
  Add-Type : Cannot add type. There were compilation errors.
  At line:22 char:1
  + Add-Type -ReferencedAssemblies $refs -TypeDefinition $code
  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : InvalidData: (:) [Add-Type], InvalidOperationException
      + FullyQualifiedErrorId : COMPILER_ERRORS,Microsoft.PowerShell.Commands.AddTypeCommand
  </code></pre>
  
  <p>How i can System.Collections.Generic assembly?</p>