The simple and archaic method is probably this: define a <form> element, set method attribute to "post", set action attribute to the target two.aspx address, and maybe make it hidden using styles. Then insert a series of <input type= “hidden” name=“…” value =“…”/> elements, which will hold the parameters to be passed to two.aspx.
In order to post the data, use submit() function of <form> element using JavaScript. For example:
<form id="form1" method="post" action="two.aspx">
<input type="hidden" name="param1" value="value1"/>
</form>
In JavaScript:
document.getElementById("form1").submit().
Probably this is another good place for such aspects: https://forums.asp.net/