What is selected index changed?
The SelectedIndexChanged event occurs when the SelectedIndex has just changed. The SelectedIndexChanged event does not fire unless the AutoPostBack property is True . The SelectedIndexChanged event handler receives two arguments: The RadDropDownList that is loading items.
What is the use of SelectedIndexChanged in asp net?
The SelectedIndexChanged event is raised when the selection from the list control changes between posts to the server. A list control must persist some values between posts to the server for this event to work correctly.
What is ListBox control event?
The ListBox represents a Windows control to display a list of items to a user. A user can select an item from the list. It allows the programmer to add items at design time by using the properties window or at the runtime.
Which event can be used to detect changes in list combo box selection?
You can use “ComboBoxItem. PreviewMouseDown” event. So each time when mouse is down on some item this event will be fired.
What is Autopostback in asp net?
Autopostback is the mechanism by which the page will be posted back to the server automatically based on some events in the web controls. In some of the web controls, the property called auto post back, if set to true, will send the request to the server when an event happens in the control.
Does ASP NET do PostBack?
PostBack is the name given to the process of submitting an ASP.NET page to the server for processing. PostBack is done if certain credentials of the page are to be checked against some sources (such as verification of username and password using database).
How many types of ListBox controls are there?
List Box Types and Styles. There are two types of list boxes: single-selection (the default) and multiple-selection. In a single-selection list box, the user can select only one item at a time. In a multiple-selection list box, the user can select more than one item at a time.
How do you empty a ListBox?
Clear ListBox With the DataSource = null Approach in C# The best solution for this would be to specify the ListBox. DataSource property equal to null to remove the data source and then use the ListBox. Items. Clear() function to clear the previous items in the list box.
Which event in a ComboBox will be executed the moment when the user changes the selected option?
When you set the combo-box to a default value, the SelectionChanged event is fired. In a majority of the cases you do not want this to happen because, 1. it’s not being triggered by a user action and 2.
What is combo box in VB?
The ComboBox control is used to display a drop-down list of various items. It is a combination of a text box in which the user enters an item and a drop-down list from which the user selects an item.
Is post back in C#?
PostBack is done if certain credentials of the page are to be checked against some sources (such as verification of username and password using database). This is something that a client machine is not able to accomplish and thus these details have to be ‘posted back’ to the server.
What happens when AutoPostBack is true?
What is selected index changed event system?
Selected Index Changed Event System. Windows. Forms Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here. Occurs when the SelectedIndex property has changed.
How to detect if the selected index in a listbox has changed?
If index = -1 Then MessageBox.Show (“Item is not available in ListBox2”) Else listBox2.SetSelected (index, True) End If End Sub You can create an event handler for this event to determine when the selected index in the ListBox has been changed.
What is combo box selected index changed event?
Combo Box. Selected Index Changed Event System. Windows. Forms Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here. Occurs when the SelectedIndex property has changed.
Why can’t I use the selectedrow property with the selectedindexchanging event?
Because the SelectedIndexChanging event ‘ occurs before the select operation in the GridView control, the ‘ SelectedRow property cannot be used. Instead, use the Rows collection ‘ and the NewSelectedIndex property of the e argument passed to this ‘ event handler.