you will need to access html elements from asp.net
code behind file.i show you how to access widely used
html textarea element from code behind file -

It's a very common requirement to create different types of button and
it's click event handler dynamically in asp.net application.

you may want to get the asp.net control's or html element's
id when clicked or other events fired for that element.
It can be done in many ways using jquery or simple javascript.

Often receiving "Fatal error: Allowed memory size of 33554432 bytes exhausted" when trying to upload an image with low mb file size. To solve this error, try to increase the memory allocated for PHP. For that you need to set the limit to 32MB, 64MB, 128MB or 256MB. However is based and depends upon your host provider.

it is easier to print part of page.the part of the page
may be under a div or panel.you can achieve this from code
behind file too as per requirement.here i showing only
in page lavel -

Do you have problem of receiving "Fatal error undefined function is_network_admin()" when you login to wordpress admin after updating WordPress.

Facebook Graph Api enables to post to any public page/profile wall
on behalf of any user.In the following codes i show how using
fb javascript sdk-