Sending disabled asp.net control's value in Request

Use the SubmitDisabledControls property to specify whether to force controls disabled on the client to submit their values when the page posts back. This allows the disabled controls to preserve their values after the page posts back to the server. When the SubmitDisabledControls property is set to false, controls on the form that have been disabled using client script will not be submitted to the server the next time the page posts back. As a result, any values stored by the disabled controls are lost. To allow the disabled controls to preserve their values after the page posts back to the server, set the SubmitDisabledControls property to true.

SubmitDisabledControls property can be set on PageLoad or inside form tag in aspx page.