assign value to dynamic div

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ASP.NET

I created a page dynamically check below the example

label l=new label()
l.id="lbltest"
l.text+="<div id=name name=name  runat="server"><br />"
l.text+="<div id=age name=age  runat="server"><br />"
l.text+="<div id=gender name=gender  runat="server"><br />"

my question is as follows I want to assign values to name and age. How can that be done?

I have tried to do it using javascript

document.getElementById("name").value="test"

but got an error NULL POINTER how can assign value to div on page load?