Accessing value of a hidden field on Masterpage from codebehind

Question

In a follow up to my previous question, I want to get the value of the hidden input field from the child page codebehind.

I tried HtmlInputHidden hdnID = (H

Answer 1

You should create a property in Masterpage which wrap the HiddenField.

public String HdnFieldValue
{
get
{
    return hidField.Value;
}
set
{
    hidField.Value = value;
}
}

And in page code behind you can access it like this:

((YourCustomMaster)Page.Master).HdnFieldValue

If something is not clear please ask me.

Answer 2

So change it FROM

HtmlInputHidden hdnID = (HtmlInputHidden)Page.Master.FindControl("ctl00_hdnField");

TO

HiddenField hdnID = (HiddenField)Page.Master.FindControl("hdnField");

It's just a casting thing - notice HtmlInputHidden changed to HiddenField. You also don't need the ct100_ part - this is just so the HTML rendered element has a unique ID.

The control on your page is an asp.net control, not a generic HTML control.

You would use HtmlInputHidden if you put a generic <input type="hidden" /> in your HTML.

Answer 3

I don't think you need to prefix the hidden field's ID with ctl00_, just use the normal ID:

(HtmlInputHidden)Page.Master.FindControl("hdnField");

Answer 4

Use something like:

if (Page.Master.FindControl("hdnField") != null)
{
    String myValue = (HtmlInputHidden)Page.Master.FindControl("hdnField").value;
}