Here Mudassar Ahmed Khan has explained with an example, how to access HTML Control values in Code Behind (Server Side) without runat server in ASP.Net using C# and VB.Net.

The values of all HTML INPUT controls are sent to Server Side on Form Submission (PostBack) and can be fetched using Request.Form collection in ASP.Net using C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to enable and disable TextBox on Button Click using JavaScript and jQuery.

When the Yes Button is clicked, the TextBox will be enabled and when the No Button is clicked the TextBox will be disabled.

Here Mudassar Ahmed Khan has explained with an example, how to show and hide TextBox on Button Click using JavaScript and jQuery.

When the Yes Button is clicked, the TextBox will be shown and when the No Button is clicked the TextBox will be hidden.

Here Mudassar Ahmed Khan has explained with an example, how to show and hide TextBox based on DropDownList selection in ASP.Net using C# and VB.Net.

When the YES item (option) is selected in the DropDownList, TextBox will be visible else the TextBox will be hidden in ASP.Net using C# and VB.Net.