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AssemblyCollection Class

Represents a collection of AssemblyInfo objects. This class cannot be inherited.

Namespace:  System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)

public sealed class AssemblyCollection : ConfigurationElementCollection

The AssemblyCollection class does not refer to any actual element in the underlying configuration file. It is a construct that allows access to the assembly information it contains.

This section provides two code examples. The first demonstrates how to declaratively specify values for several properties of the AssemblyCollection class. The second demonstrates how to use members of the AssemblyCollection class.

The following configuration file example shows how to declaratively specify values for several properties of the AssemblyCollection class.

      <add assembly="mscorlib" />
      <add assembly="System, Version=, Culture=neutral, 
        PublicKeyToken=b77a5c561934e089" />
      <add assembly="System.Configuration, Version=, 
        Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.Web, Version=, Culture=neutral, 
        PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.Data, Version=, Culture=neutral, 
        PublicKeyToken=b77a5c561934e089" />
      <add assembly="System.Web.Services, Version=, 
        Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.Xml, Version=, Culture=neutral, 
        PublicKeyToken=b77a5c561934e089" />
      <add assembly="System.Drawing, Version=, 
        Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.EnterpriseServices, Version=, 
        Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.Web.Mobile, Version=, 
        Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="System.Web.UI.MobileControls.Adapters, 
        Version=, Culture=neutral, 
        PublicKeyToken=b03f5f7f11d50a3a" />
      <add assembly="*" />

The following code example demonstrates how to use members of the AssemblyCollection class.

#region Using directives

using System;
using System.Configuration;
using System.Web.Configuration;


namespace Samples.Aspnet.SystemWebConfiguration
  class UsingAssemblyCollection
    static void Main(string[] args)
        // Set the path of the config file.
        string configPath = "";

        // Get the Web application configuration object.
        Configuration config = 

        // Get the section related object.
        CompilationSection configSection =

        // Display title and info.
        Console.WriteLine("ASP.NET Configuration Info");

        // Display Config details.
        Console.WriteLine("File Path: {0}",
        Console.WriteLine("Section Path: {0}",

        // Create a new assembly reference.
        AssemblyInfo myAssembly = 
          new AssemblyInfo("MyAssembly, Version=1.0.0000.0, " +
          "Culture=neutral, Public KeyToken=b03f5f7f11d50a3a");
        // Add an assembly to the configuration.

        // Add a second assembly reference.
        AssemblyInfo myAssembly2 = new AssemblyInfo("MyAssembly2");

        // Assembly Collection 
        int i = 1;
        int j = 1;
        foreach (AssemblyInfo assemblyItem in configSection.Assemblies)
          Console.WriteLine("Assemblies {0} Details:", i);
          Console.WriteLine("Type: {0}", assemblyItem.ElementInformation.Type);
          Console.WriteLine("Source: {0}", assemblyItem.ElementInformation.Source);
          Console.WriteLine("LineNumber: {0}", assemblyItem.ElementInformation.LineNumber);
          Console.WriteLine("Properties Count: {0}", 
          j = 1;
          foreach (PropertyInformation propertyItem in assemblyItem.ElementInformation.Properties)
            Console.WriteLine("Property {0} Name: {1}", j, propertyItem.Name);
            Console.WriteLine("Property {0} Value: {1}", j, propertyItem.Value);

        // Remove an assembly.
        configSection.Assemblies.Remove("MyAssembly, Version=1.0.0000.0, " +
          "Culture=neutral, Public KeyToken=b03f5f7f11d50a3a");

        // Remove an assembly.
        configSection.Assemblies.RemoveAt(configSection.Assemblies.Count - 1);

        // Update if not locked. 
        if (!configSection.SectionInformation.IsLocked)
          Console.WriteLine("** Configuration updated.");
          Console.WriteLine("** Could not update, section is locked.");

      catch (Exception e)
        // Unknown error.

      // Display and wait.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0