CODEWITHSUNDEEP
c#.netlistboxbindlistitem
user2504955
user2504955

Reputation: 41

How to add text item to a winform listbox that been already bound with a datasource

I have c# Winform Listbox that is already been bound to a data source.

var custList=Cusomer.CustomerList();
lstbox.DataSource=custList;
`enter code here`
lstbox.DisplayMember="CustName";
lstbox.ValueMemebr="CustId";

Now I want to add a text called "All" to the same list box so that it should be displayed as the first listitem. Also the list items added through binding should also be present there. My idea is when the user selects the "ALL" option all of the list items has to be selected automatically.

Any idea how I can add the new text value?

Thanks.

Upvotes: 3

Views: 3027

Answers (2)

agarici
agarici

Reputation: 612

hope this will help you.

    void InitLstBox()
    {
        //Use a generic list instead of "var"
        List<Customer> custList = new List<Customer>(Cusomer.CustomerList());
        lstbox.DisplayMember = "CustName";
        lstbox.ValueMember = "CustId";
        //Create manually a new customer
        Customer customer= new Customer();
        customer.CustId= -1;
        customer.CustName= "ALL";
        //Insert the customer into the list
        custList.Insert(0, contact);

        //Bound the listbox to the list
        lstbox.DataSource = custList;

        //Change the listbox's SelectionMode to allow multi-selection
        lstbox.SelectionMode = SelectionMode.MultiExtended;
        //Initially, clear slection
        lstbox.ClearSelected();
    }

And if you want to select all customer when the user select ALL, add this method:

    private void lstbox_SelectedIndexChanged(object sender, EventArgs e)
    {
        //If ALL is selected then select all other items
        if (lstbox.SelectedIndices.Contains(0))
        {
            lstbox.ClearSelected();
            for (int i = lstbox.Items.Count-1 ; i > 0 ; i--)
                lstbox.SetSelected(i,true);
        }
    }

Off course, don't forget to set the event handler :)

 this.lstbox.SelectedIndexChanged += new System.EventHandler(this.lstbox_SelectedIndexChanged);

Upvotes: 0

Darren
Darren

Reputation: 70718

Use ListBox.Items.Insert and specify 0 as the index. 

ListBox1.Items.Insert(0, "All");

Upvotes: 2

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