See example:

using System;

using System.Collections;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Windows.Forms;

// Add in these using clauses for this example

using System.Runtime.InteropServices;

using System.Text;

using System.Reflection;

using Microsoft.Win32;

namespace WinCtrlLib1

{

/// <summary>

/// Summary description for UserControl1.

/// </summary>

[Guid("CE41F576-F0C9-4509-B1B6-BD710DA329CA")]

[ProgId("WinCtrlLib1.UserCtrl1")]

[ClassInterface(ClassInterfaceType.AutoDual)]

public class UserCtrl1 : System.Windows.Forms.UserControl

{

private System.Windows.Forms.TextBox txtBox;

private System.Windows.Forms.Button btnOK;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

public UserCtrl1()

{

// This call is required by the Windows.Forms Form Designer.

InitializeComponent();

// TODO: Add any initialization after the InitComponent call

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if( components != null )

components.Dispose();

}

base.Dispose( disposing );

}

#region Component Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.txtBox = new System.Windows.Forms.TextBox();

this.btnOK = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// txtBox

//

this.txtBox.Location = new System.Drawing.Point(24, 24);

this.txtBox.Name = "txtBox";

this.txtBox.Size = new System.Drawing.Size(104, 20);

this.txtBox.TabIndex = 0;

this.txtBox.Text = "";

//

// btnOK

//

this.btnOK.Location = new System.Drawing.Point(40, 64);

this.btnOK.Name = "btnOK";

this.btnOK.TabIndex = 1;

this.btnOK.Text = "OK";

this.btnOK.Click += new System.EventHandler(this.btnOK_Click);

//

// UserCtrl1

//

this.Controls.Add(this.btnOK);

this.Controls.Add(this.txtBox);

this.Name = "UserCtrl1";

this.Size = new System.Drawing.Size(150, 104);

this.ResumeLayout(false);

}

#endregion

[ComRegisterFunction]

static void ComRegister(Type t)

{

string keyName = @"CLSID\" + t.GUID.ToString("B");

using( RegistryKey key =

Registry.ClassesRoot.OpenSubKey(keyName, true) )

{

key.CreateSubKey("Control").Close();

using( RegistryKey subkey = key.CreateSubKey("MiscStatus") )

{

subkey.SetValue("", "131457");

}

using( RegistryKey subkey = key.CreateSubKey("TypeLib") )

{

Guid libid = Marshal.GetTypeLibGuidForAssembly(t.Assembly);

subkey.SetValue("", libid.ToString("B"));

}

using( RegistryKey subkey = key.CreateSubKey("Version") )

{

Version ver = t.Assembly.GetName().Version;

string version =

string.Format("{0}.{1}",

ver.Major,

ver.Minor);

if( version == "0.0" ) version = "1.0";

subkey.SetValue("", version);

}

}

}

[ComUnregisterFunction]

static void ComUnregister(Type t)

{

// Delete entire CLSID\{clsid} subtree

string keyName = @"CLSID\" + t.GUID.ToString("B");

Registry.ClassesRoot.DeleteSubKeyTree(keyName);

}

private void btnOK_Click(object sender, System.EventArgs e)

{

MessageBox.Show(this.txtBox.Text);

}

}

}