如何给top.location.href带参数？

如何给username带参数？ 
string username = reader["username"].ToString();
this.Response.Write("<script>top.location.href='three.aspx?username='; </script>");  --------------------编程问答-------------------- 用username=<%=username%> --------------------编程问答--------------------

this.Response.Write(string.Format("<script>top.location.href='three.aspx?username={0}'; </script>",'参数名称变量'));  

--------------------编程问答--------------------

Response.Redirect("three.aspx?username="+reader["username"].ToString()); 

--------------------编程问答--------------------

 string strValue = "abcd";

 Response.Write("<script>top.location.href='Test2.aspx?username="+ strValue +"'</script>"); 

补充：.NET技术 ,  ASP.NET