<input type="hidden" id="myHiddenField">

document.getElementById("myHiddenField").value = "HiddenValue"

protected void Page_Load(object sender, EventArgs e)
{
     //Why cannot get anything here???
     string hiddenStr = Request.Form["myHiddenField"];
}

I can get values from textbox that is enabled and visible. Is there anyway
around?

Thanks.