Problem with ListBox in ASP.NET

Question

Hi,
Top of the hour to you all. I have got this little problem in asp.net c#. I have got a ListBox which some listItem like

Mango
Orange
Banana

I want to achieve this, when a user clicks on a list item for example click on 'Mango' the mango ListItem should only be disabled in the ListBox ....

Thanks in advance

Soft Corner · Answer

Yes your exactly right, giwa's requirement for disabling the items on selection. And if the case for removing item on selection then we can also use listBox1.Items.RemoveAt(listBox1.SelectedIndex);

Vulpes · Answer

Before my first post, I tried virtually the same code as you and what it did was to remove the items (rather than gray them out) though, admittedly, they do come back when you set Enabled back to true. On the other hand, when you set Enabled to false for items in the CheckBoxList and RadioButtonList it does gray them out i.e. what you'd normally understand by disabling them. It may be, of course, that Giwa doesn't mind temporarily removing the items from the ListBox and, if so, then I think your code is the best solution for him.

Soft Corner · Answer

Hi Vulpes, I think you miss understood some whr, my code will work for Items which are in ListBox control and in MSDN link , they are talking about ListItem for RadioButtonList control or a CheckBoxList control. and above code i have implemented & it works for me. Thanks

Vulpes · Answer

There's an example here ( http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listitem.enabled.aspx ) which shows how to disable items from a RadioButtonList. Unfortunately, Shrikant's code doesn't work because as it says in the above link: "You cannot use this property to disable a ListItem control in a DropDownList control or ListBox control."

Soft Corner · Answer

Hi Giwa, You Can disable the items in listbox , i took one listbox and a button on page. Button is used to retrive items which are disabled in list. try this : protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { listBox1.Items.Add("Item1"); listBox1.Items.Add("Item2"); listBox1.Items.Add("Item3"); } } protected void listBox1_SelectedIndexChanged(object sender, EventArgs e) { listBox1.SelectedItem.Enabled = false; } protected void Button1_Click(object sender, EventArgs e) { for (int i = 0; i { listBox1.Items[i].Enabled = true; } }

Giwa Abdulhakeem · Answer

Hi, Would really appreciate a snippet on that though. Cheers

Vulpes · Answer

To my knowledge, you can't disable items in the standard ListBox control though you can do this in a RadioButtonList or a CheckBoxList control if that's any help to you.

Problem with ListBox in ASP.NET

Answers (7)