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Google Adword and asp.net master pages
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace SATest
{
    [DefaultProperty("ConversionCode")]
    [ToolboxData("<{0}:AdwordConversion runat=server></{0}:AdwordConversion>")]
    public class AdwordConversion : Control
    {
        private const string _conversionCodeKey = "cc";
        private const string _includeScriptKey  = "ic";

        [Category("Behavior")]
        [DefaultValue("")]
        public string ConversionCode
        {
            get { return (String)(ViewState[_conversionCodeKey] ?? "" ); }
            set { ViewState[_conversionCodeKey] = value; }
        }

        [Category("Behavior")]
        [DefaultValue(false)]
        public bool IncludeScript
        {
            get { return (bool)(ViewState[_includeScriptKey] ?? false ); }
            set { ViewState[_includeScriptKey] = value; }
        }


        protected override void Render(HtmlTextWriter writer)
        {
            if ( !IncludeScript ) { return; }

            string js = "<script type="text/javascript">...Insert conversion code here: var code = " + ConversionCode + ";</script>";

            writer.Write( js );
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);

            if ( Page.Items.Contains( typeof(AdwordConversion) ) )
            {
                throw new ApplicationException( "There can be only one AdwordConversion control defined on a page.  Use AdwordConversionProxy." );
            }

            Page.Items[typeof(AdwordConversion)] = this;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace SATest
{
    [DefaultProperty("ConversionCode")]
    [ToolboxData("<{0}:AdwordConversionProxy runat=server></{0}:AdwordConversionProxy>")]
    public class AdwordConversionProxy : Control
    {
        private string _conversionCode;
        private bool?  _includeScript;

        public string ConversionCode
        {
            get { return _conversionCode; }
            set { _conversionCode = value; }
        }

        public bool IncludeScript
        {
            get { return ( _includeScript.HasValue ) ? _includeScript.Value : false; }
            set { _includeScript = value; }
        }


        protected override void Render(HtmlTextWriter writer)
        {
        }

        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);

            AdwordConversion current = Page.Items[typeof(AdwordConversion)] as AdwordConversion;

            if ( current == null )
            {
                throw new ApplicationException( "AdwordConversionProxy requires that an AdwordConversion control already exist on a page." );
            }

            if ( _conversionCode != null )
            {
                current.ConversionCode = _conversionCode;
            }

            if ( _includeScript.HasValue )
            {
                current.IncludeScript = _includeScript.Value;
            }
        }
    }
}