Create XML file and Bind XML data to DropDownList using DataSet in asp.net http://www.webcodeexpert.com/2013/05/create-xml-file-and-bind-xml-data-to.html
jQuery to Dynamically Change or Set Placeholder Text in Asp.Net TextBox on DropDownlist Selected Item Change http://www.webcodeexpert.com/2016/01/jquery-to-dynamically-change-or-set.html In this article I have explained How to dynamically change or set placeholder text in Asp.Net TextBox or Multiline Textbox using jQuery on DropDownList selected item change.
jQuery to Enable,Disable,Show and Hide Asp.net DropDownList,TextBox and Button controls based on DropDownList selected value http://www.webcodeexpert.com/2014/08/jquery-to-enabledisableshow-and-hide.html
jQuery to Show/Hide the controls placed inside Div based on Asp.net DropDownList selected value http://www.webcodeexpert.com/2014/07/jquery-to-showhide-div-content-based-on.html
Dropdownlist items find by partial value in ASP.
AngularJS: Bind DropDownList text and value using ng-options http://www.webcodeexpert.com/2016/06/angularjs-bind-dropdownlist-value-and_22.html In this article I am going to explain how to populate HTML dropdown list using ng-options in AngularJs.