In this article I will explain with an example, how to disable an item (option) i.e. make not Selectable in ASP.Net DropDownList using C# and VB.Net. nside the Page Load event of the page, the DropDownList is populated with the records of the Customers Table using SqlDataReader. For more details about populating DropDownList using

 In order to implement a Multiple Select (MultiSelect) DropDownList with CheckBoxes in ASP.Net we will need to make use of ListBox control and apply the jQuery Bootstrap Multi-Select Plugin to it.