Private Void Object Sender Eventargs
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Private Void Object Sender Eventargs
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Asked
8 years, 2 months ago
Active
8 years, 2 months ago
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Put a breakpoint on it and figure out precisely what's null in that line. Is it the ListBox? Is it the SelectedItem?
– tmesser
Nov 7 '12 at 19:44
I think that after you delete the item the selected index of the drop down list get's changed to the item you've just deleted
– Mihai
Nov 7 '12 at 19:45
I think is is the selecteditem
– Orange Light
Nov 7 '12 at 19:46
how would i make a breakpoints for it?
– Orange Light
Nov 7 '12 at 19:57
@OrangeLight in visual studio just click on the margin to the left of the line number, that will create a breakpoint. More info here . Also, just FYI, if you don't preface your comment with @YYY , I don't see that you've replied.
– tmesser
Nov 7 '12 at 21:08
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im trying delete an item on a listbox but when I press the button to delete it the first line of the code in the private void listBox1_SelectedIndexChanged(object sender, EventArgs e) gets an error.
here is the error
Object reference not set to an instance of an object.
Either textBox1 , listBox1 , or listBox1.SelectedItem is null .
When the exception comes up, use the locals and watch tab at the bottom of your screen to see which one it is.
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NET Events - What are object sender & EventArgs e? - Stack Overflow
c# - Fisrt line of private void listBox1_SelectedIndexChanged( object ...)
Event Handlers Overview - Windows Forms .NET Framework | Microsoft Docs
[Solved] What does ( object sender , eventargs e) imply? - CodeProject
EventHandler, sender and EventArgs in C# - Follow the white rabbit...
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An event handler is a method that is bound to an event. When the event is raised, the code within the event handler is executed. Each event handler provides two parameters that allow you to handle the event properly. The following example shows an event handler for a Button control's Click event.
The first parameter, sender , provides a reference to the object that raised the event. The second parameter, e , in the example above, passes an object specific to the event that is being handled. By referencing the object's properties (and, sometimes, its methods), you can obtain information such as the location of the mouse for mouse events or data being transferred in drag-and-drop events.
Typically each event produces an event handler with a different event-object type for the second parameter. Some event handlers, such as those for the MouseDown and MouseUp events, have the same object type for their second parameter. For these types of events, you can use the same event handler to handle both events.
You can also use the same event handler to handle the same event for different controls. For example, if you have a group of RadioButton controls on a form, you could create a single event handler for the Click event and have each control's Click event bound to the single event handler. For more information, see How to: Connect Multiple Events to a Single Event Handler in Windows Forms .
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