Category - UpdatePanel
13 Jun 2019 13 Jun 2019 0 Comments  3260 Views
Here Mudassar Ahmed Khan has explained with an example, how to avoid (Prevent) Page refresh (reload) after SelectedIndexChanged is fired in ASP.Net DropDownList using C# and VB.Net.

The only possible way is to place the DropDownList inside ASP.Net AJAX UpdatePanel so that, instead of Full PostBack which causes Page refresh (reload), a Partial PostBack will occur.
27 Jul 2018 27 Jul 2018 0 Comments  9386 Views
Here Mudassar Ahmed Khan has provided solution to the problem: - JavaScript not working in UpdatePanel after PostBack in ASP.Net.
04 Nov 2012 22 Apr 2019 3 Comments  87702 Views
Here Mudassar Ahmed Khan has explained with an example, how to build Country State City Cascading DropDownList in ASP.Net i.e. Country State City Cascading DropDownList populated from Database and dependent on each other.

First the Country DropDownList will be populated on Page Load event. Then when a Country is selected, the SelectedIndexChanged event will fire and the State DropDownList will be populated based on the selected Country.

In similar way, when the State is selected, the SelectedIndexChanged event will fire and the City DropDownList will be populated based on the selected State.