Powershell script to changes references of all projects under the execution directory

ChangeAllReferences.ps1

# Calling Convention
#   ChangeReference.ps1 "log4net , Version=1.2.0.0 ......" "new dll path" , "log4net , <new dll  infor>" 
# Note : This needs script signing before executing. refer http://www.hanselman.com/blog/SigningPowerShellScripts.aspx 
# OR can set the powershell execution policy to unrestricted (at your own risk ;)) > Set-ExecutionPolicy unrestricted 

param([String]$ReferenceToRemove , [String]$NewAssemblyPath, [String]$NewAssemblyIncludeInfo)

$xmlns = "http://schemas.microsoft.com/developer/msbuild/2003"

$projects = ls -r -i *.csproj
foreach($projectPath in $projects) 
{
    $proj = [xml](Get-Content $projectPath)
	[System.Console]::WriteLine($project);
    
    $XPath = [string]::Format("//a:Reference[@Include='{0}']", $ReferenceToRemove)   
    [System.Console]::WriteLine("Finding reference {0} in {1}", $ReferenceToRemove, $projectPath); 
    
    [System.Xml.XmlNamespaceManager] $nsmgr = $proj.NameTable
    $nsmgr.AddNamespace('a','http://schemas.microsoft.com/developer/msbuild/2003')
    $node = $proj.SelectSingleNode($XPath, $nsmgr)
    
    if ($node)
    { 
      [System.Console]::WriteLine("Removing the assembly reference {0} in project {1}", $ReferenceToRemove , $projectPath)
      
      #Removing the child
      $parentNode = $node.ParentNode;
      $parentNode.RemoveChild($node);         
      
      #Adding a new item
      $referenceNode = $proj.CreateElement("Reference", $xmlns);
      $referenceNode.SetAttribute("Include", $NewAssemblyIncludeInfo);
      $parentNode.AppendChild($referenceNode)

      $hintPath = $proj.CreateElement("HintPath", $xmlns);
      $hintPath.InnerXml = $NewAssemblyPath;
      $referenceNode.AppendChild($hintPath);
 
      $proj.Save($projectPath)
        
    }
    else
    {
        [System.Console]::WriteLine("Cannot find the assembly reference {0} in project {1}", $ReferenceToRemove , $projectPath)
    }


}