“The Controls collection cannot be modified because the control contains code blocks”

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First, start the code block with <%# instead of <%= :

<head id="head1" runat="server">
  <title>My Page</title>
  <link href="https://stackoverflow.com/questions/778952/css/common.css" rel="stylesheet" type="text/css" />
  <script type="text/javascript" src="<%# ResolveUrl("~/javascript/leesUtils.js") %>"></script>
</head>

This changes the code block from a Response.Write code block to a databinding expression.
Since <%# ... %> databinding expressions aren’t code blocks, the CLR won’t complain. Then in the code for the master page, you’d add the following:

protected void Page_Load(object sender, EventArgs e)
{
  Page.Header.DataBind();    
}

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