How to check if an item inside a CheckBoxList is UnChecked?

Question

Hi,

Suppose i have three dependant checkboxlists and i want to add/remove items from the 2nd and 3rd checkboxlist on the basis of 1st/2nd.

How can i detect if a particular item inside a checkboxlist is unchecked?

Any example would be appreciated.

Thanks

Answer 1

You should ask questions in the forum specific to your technology so people know which you're using and you get the best support on your issues.

.

I guess windows forms.

There's an event you can handle on the CheckedListBox.

It tells you which has changed and what the new value is.

It fires when you check or un check.

private void CheckedListBox1_ItemCheck(Object sender, ItemCheckEventArgs e)
 {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "Index", e.Index );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "NewValue", e.NewValue );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "CurrentValue", e.CurrentValue );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "ItemCheck Event" );
}

https://msdn.microsoft.com/en-us/library/system.windows.forms.checkedlistbox.itemcheck%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

If this is instead asp.net then the event is onselectedIndexChanged, like:

<asp:RadioButtonList id="RadioButtonList1" 
            OnSelectedIndexChanged="Index_Changed"
            AutoPostBack="true"
            runat="server"/>

void Index_Changed(Object sender, EventArgs e) 
{
         Label1.Text = "You selected " + RadioButtonList1.SelectedItem.Text +
                     " with a value of $" + RadioButtonList1.SelectedItem.Value +
                     ".";
}

From http://stackoverflow.com/questions/18486574/checkboxlist-item-checked-event

---

Hope that helps.

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Answer 2

hello

you can iterate throw a listbox very easily like this

            for (int i = 0; i < this.checkedListBox1.Items.Count; ++i )
            {
                if (checkedListBox1.GetItemChecked(i))
                {
                    MessageBox.Show("checked at position "+ i as string);
                }
                else
                {
                    MessageBox.Show("unchecked at position " + i as string);
                }
            }

hope it he;ps

Answer 3

The CheckedListBox control in Windows Forms has a CheckedItems that returns a collection of the the checked items: https://msdn.microsoft.com/en-us/library/system.windows.forms.checkedlistbox.checkeditems%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

foreach(object itemChecked in checkedListBox1.CheckedItems) {

        YourType obj = itemChecked as YourType;
 //...
    }

If you are using the CheckBoxList class in ASP.NET, each item in it has a Selected property: https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkboxlist(v=vs.110).aspx

Note that you should ask ASP.NET and web related questions at http://forums.asp.net and not here though.

Hope that helps.

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