Validating dropdown list selection in asp c sharp

You can delete items with the Remove method or clear the entire list with the Clear method.

The Drop Down Style property specifies whether the list is always displayed or whether the list is displayed in a drop-down.

I’m using Entity Framework with POCO-s and this solution makes some use of Entity Framework features that maybe other mappers doesn’t support this way. We need two things: By example, when we want to let user select tags for some event we need list of all tags to show and list of current tags to know what tags exactly must be shown as selected.

My base class for business classes is as follows: You can define also abstract property like Display Name for business base class to make sure that all business classes have string presentation understandable to humans. To meet these needs I wrote simple extension method to business base class type of collections: This method creates list of Select List Items for all Collection and uses checked Collection to find out if current item must be displayed as checked or not. Now as we have data for checkbox list we can focus on displaying it.

Most of the Web Pages HTML Helpers work in the same way to MVC, and have a similar set of overloads.

The Text Box helper is a good example for illustrating the basics.

You can add individual objects with the Add method.This article provides an overview of Web Pages HTML Helpers, and digs into one or two in more detail.There are HTML helpers for every kind of form control: check boxes, hidden fields, password boxes, radio buttons, text boxes, text areas, dropdown lists and list boxes.We can change docking and other properties using the Tasks control as shown in Figure 1. We can set properties by calling Properties window if a control using Right click on the control and selecting Properties menu item or simply hit F4.Figure 2 shows Properties window where I set Back Color to green and Grip Style to Visible.Couple of years ago I worked out my first solution for checkbox list in ASP. Today I got some markable simplifications done and my solution is close to state where some nice-to-have tweaks can be done to add more automatics to controller side but solution is also good enough how it is like now.

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