ItemCheckEventArgs.Index Property

Gets the zero-based index of the item to change.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public int Index { get; }

Property Value

Type: System.Int32
The zero-based index of the item to change.

You can use this property to determine which item's check box in the CheckedListBox is being changed.

The following code example demonstrates a checked ListView control that handles the ListView.ItemChecked event. The method uses the CurrentValue and Index properties of the ItemCheckEventArgs object to retrieve and tally the price of the menu items selected. To run this example paste the following code in a form containing a ListView named ListView1 and a TextBox named Textbox1. Call the InititalizeListView method from the form's constructor or Load method. Ensure all events are associated with their event-handling methods.

	private void InitializeListView()
	{
		this.ListView1 = new System.Windows.Forms.ListView();

		// Set properties such as BackColor and DockStyle and Location. 
		this.ListView1.BackColor = System.Drawing.SystemColors.Control;
		this.ListView1.Dock = System.Windows.Forms.DockStyle.Top;
		this.ListView1.Location = new System.Drawing.Point(0, 0);
		this.ListView1.Size = new System.Drawing.Size(292, 130);
		this.ListView1.View = System.Windows.Forms.View.Details;
		this.ListView1.HideSelection = false;

		// Allow the user to select multiple items. 
		this.ListView1.MultiSelect = true;

		// Show CheckBoxes in the ListView. 
		this.ListView1.CheckBoxes = true;
		
		//Set the column headers and populate the columns.
		ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;
		
		ColumnHeader columnHeader1 = new ColumnHeader();
		columnHeader1.Text = "Breakfast Choices";
		columnHeader1.TextAlign = HorizontalAlignment.Left;
		columnHeader1.Width = 146;

		ColumnHeader columnHeader2 = new ColumnHeader();
		columnHeader2.Text = "Price Each";
		columnHeader2.TextAlign = HorizontalAlignment.Center;
		columnHeader2.Width = 142;

       	this.ListView1.Columns.Add(columnHeader1);
		this.ListView1.Columns.Add(columnHeader2);

		string[] foodList = new string[]{"Juice", "Coffee", 
			"Cereal & Milk", "Fruit Plate", "Toast & Jelly", 
			"Bagel & Cream Cheese"};

		string[] foodPrice = new string[]{"1.09", "1.09", "2.19", 
			"2.79", "2.09", "2.69"};
		
		int count;

		// Members are added one at a time, so call BeginUpdate to ensure  
		// the list is painted only once, rather than as each list item is added.
		ListView1.BeginUpdate();

		for(count = 0; count < foodList.Length; count++)
		{
			ListViewItem listItem = new ListViewItem(foodList[count]);
			listItem.SubItems.Add(foodPrice[count]);
			ListView1.Items.Add(listItem);
		}

		//Call EndUpdate when you finish adding items to the ListView.
		ListView1.EndUpdate();
		this.Controls.Add(this.ListView1);
	}


...


	double price = 0.0;

	// Handles the ItemCheck event. The method uses the CurrentValue 
	// property of the ItemCheckEventArgs to retrieve and tally the   
	// price of the menu items selected.   
	private void ListView1_ItemCheck1(object sender, 
		System.Windows.Forms.ItemCheckEventArgs e)
	{
		if (e.CurrentValue==CheckState.Unchecked)
		{
			price += Double.Parse(
				this.ListView1.Items[e.Index].SubItems[1].Text);
		}
		else if((e.CurrentValue==CheckState.Checked))
		{
			price -= Double.Parse(
				this.ListView1.Items[e.Index].SubItems[1].Text);
		}

		// Output the price to TextBox1.
		TextBox1.Text = price.ToString();
	}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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