C#

using System;
using System.ComponentModel;
using System.Configuration;
using System.Configuration.Install;
using System.Diagnostics;
using System.IO;


namespace RegisterComponent
{
	/// <summary>
	/// Provides the custom actions for installing the PL Core components
	/// </summary>
	[RunInstaller(true)]
	public class RegisterComponent:Installer
	{

		string dllPath;
		
		#region ..ctor Implementation

		public new void Dispose()
		{
			this.Dispose(true);
			GC.SuppressFinalize(this);
		}
		public new void Dispose(bool disposing)
		{
			if (disposing) 
			{}
			base.Dispose(disposing);
		}

		#endregion

		#region Custom Install Actions

		/// <summary>
		/// Registers the DLL's in the GAC
		/// </summary>
		/// <param name="stateSaver"></param>
		public override void Install(System.Collections.IDictionary stateSaver)
		{
			try
			{
				this.dllPath = this.Context.Parameters["parm"];
				System.Diagnostics.Trace.WriteLine("Saving the Path of the core components", "RegistrationInstaller");
				stateSaver.Add("Path", dllPath);  // saves the users path for uninstall
				System.Diagnostics.Trace.WriteLine("Performing the base install", "RegistrationInstaller");
				base.Install (stateSaver);

				// now that files are all installed, register the components in the GAC
				System.Diagnostics.Trace.WriteLine("Creating the file for GAC registration", "RegistrationInstaller");
				using (StreamWriter gacutil = File.CreateText(dllPath+"install.cmd") )
				{
					gacutil.WriteLine("Echo off");
					gacutil.WriteLine(@"PATH C:\Winnt\Microsoft.NET\Framework\v1.1.3705");
					gacutil.WriteLine(String.Format(@"gacutil /ir FILEPATH {0}\Components\plcorecommon.dll ""Common Methods 1.1""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ir FILEPATH {0}\Components\plcoredbclient.dll ""DB Client Methods 1.1""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ir FILEPATH {0}\Components\plcoreweb.dll ""Remote Methods""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ir FILEPATH {0}\Components\plcorewebdb.dll ""Remote DB Methods""",dllPath));

				}

				// launch the batch process to register the dll's in the GAC
				System.Diagnostics.Trace.WriteLine("Starting the process to register the GAC", "RegistrationInstaller");
				Process install = Process.Start(String.Concat(dllPath, "install.cmd"));
				install.WaitForExit();
				install.Close();
				//File.Delete(dllPath+"install.cmd");
				System.Diagnostics.Trace.WriteLine("GAC Registration complete.", "RegistrationInstaller");
			}
			catch (Exception e)
			{
				string msg = "Error creating/running GAC utility bat file: " + e.Message+System.Environment.NewLine
					+ e.StackTrace;
				this.Context.LogMessage(msg);
			}
		}
		#endregion

		#region Uninstall Actions
		/// <summary>
		/// Uninstalls the DLL's from the GAC
		/// </summary>
		/// <param name="savedState"></param>
		public override void Uninstall(System.Collections.IDictionary savedState)
		{
			try
			{
				dllPath = savedState["Path"].ToString();
				using (StreamWriter gacutil = File.CreateText(dllPath+"install.cmd") )
				{
					gacutil.WriteLine("Echo off");
					gacutil.WriteLine(@"PATH C:\Winnt\Microsoft.NET\Framework\v1.1.3705");
					gacutil.WriteLine(String.Format(@"gacutil /ur FILEPATH {0}\Components\plcorecommon.dll ""Common Methods 1.1""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ur FILEPATH {0}\Components\plcoredbclient.dll ""DB Client Methods 1.1""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ur FILEPATH {0}\Components\plcoreweb.dll ""Remote Methods""",dllPath));
					gacutil.WriteLine(String.Format(@"gacutil /ur FILEPATH {0}\Components\plcorewebdb.dll ""Remote DB Methods""",dllPath));

				}

				// launch the batch process to unregister the files in the GAC
				Process uninstall = Process.Start( String.Concat(dllPath, "install.cmd") );
				uninstall.WaitForExit();
				uninstall.Close();

				//File.Delete(String.Concat(dllPath, "install.cmd");
			
				// with the files now removed from the GAC, the uninstall can begin.
				base.Uninstall (savedState);
			}
			catch (Exception e)
			{
				string msg = "Error creating/running deregistration bat file: " + e.Message+System.Environment.NewLine
					+ e.StackTrace;
				this.Context.LogMessage(msg);
				base.Uninstall(savedState);
			}
		}
		#endregion

	}
}