asp.net中使用c#出错

ASP.NET dooesn't allow you to have execution statements outside methods, try<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Data" %>
<html>
<head>
<title>Datetime</title>
<script language="C#" runat=server>
    TimeSpan ts = new TimeSpan((Int64)10e12);
    double totalms;
void Page_Load(Object o, EventArgs e)
{
totalms= ts.TotalMilliseconds;
}
</script>
<body>
<font>  "<%=totalms%>"  </font> <br>
</body>
</html>

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//**********
ASP.csharpdate_aspx.cs　　　　　　　//后缀定为.cs
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Data" %>＊＊＊＊＊＊＊＊＊＊检查这里//
<html>
<head>
<title>Datetime</title>
<script language="C#" runat=server>
    TimeSpan ts = new TimeSpan((Int64)10e12);
    double totalms;
void Page_Load(Object o, EventArgs e)
{
totalms= ts.TotalMilliseconds;
}
</script>
<body>
<font>  "<%=totalms%>"  </font> <br>
</body>
</html>