Call JavaScript function from Code Behind without using ScriptManager in ASP.Net using C# and VB.Net

Here Mudassar Ahmed Khan has explained with an example, how to call JavaScript function from Code Behind without using ScriptManager in ASP.Net using C# and VB.Net. In order to call the JavaScript function from Code Behind without using ScriptManager, one has to make use of the RegisterStartupScript method of the ClientScript class in ASP.Net using C# and VB.Net.