DataGrid.SelectedIndex Property
.NET Framework 4.5
Gets or sets the index of the selected item in the DataGrid control.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | The specified index is less than -1. |
The following code example demonstrates how to use the SelectedIndex property to determine the index number of the selected item in the DataGrid control. It also shows how to select and deselect an item programmatically.
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <script language="C#" runat="server"> DataTable Cart = new DataTable(); DataView CartView; void Page_Load(Object sender, EventArgs e) { DataRow dr; if (Session["ShoppingCart"] == null) { Cart.Columns.Add(new DataColumn("Qty", typeof(String))); Cart.Columns.Add(new DataColumn("Item", typeof(String))); Cart.Columns.Add(new DataColumn("Price", typeof(String))); Session["ShoppingCart"] = Cart; // Create rows and add sample data. for (int i = 1; i <= 9; i++) { dr = Cart.NewRow(); if (i % 2 != 0) dr[0] = "2"; else dr[0] = "1"; dr[1] = "Item " + i.ToString(); dr[2] = (1.23 * (i + 1)).ToString(); Cart.Rows.Add(dr); } } else Cart = (DataTable)Session["ShoppingCart"]; CartView = new DataView(Cart); CartView.Sort="Item"; if (!IsPostBack) BindGrid(); } void MyDataGrid_Select(Object sender, EventArgs e) { Label1.Text = "You selected " + MyDataGrid.SelectedItem.Cells[1].Text + ".<br />" + MyDataGrid.SelectedItem.Cells[1].Text + " has an index number of " + MyDataGrid.SelectedIndex.ToString() + "."; } void Select_Button_Click(Object sender, EventArgs e) { MyDataGrid.SelectedIndex = 4; } void UnSelect_Button_Click(Object sender, EventArgs e) { MyDataGrid.SelectedIndex = -1; Label1.Text = ""; } void BindGrid() { MyDataGrid.DataSource = CartView; MyDataGrid.DataBind(); } </script> <head runat="server"> <title>DataGrid Selection Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataGrid Selection Example</h3> <asp:DataGrid id="MyDataGrid" runat="server" BorderColor="black" BorderWidth="1" CellPadding="3" Font-Names="Verdana" Font-Size="8pt" OnSelectedIndexChanged="MyDataGrid_Select" AutoGenerateColumns="false"> <HeaderStyle BackColor="#aaaadd"> </HeaderStyle> <SelectedItemStyle BackColor="Yellow"> </SelectedItemStyle> <Columns> <asp:ButtonColumn HeaderText="Select Item" ButtonType="LinkButton" Text="Select" CommandName="Select"> </asp:ButtonColumn> <asp:BoundColumn HeaderText="Item" ReadOnly="true" DataField="Item"/> <asp:BoundColumn HeaderText="Quantity" DataField="Qty"/> <asp:BoundColumn HeaderText="Price" DataField="Price"/> </Columns> </asp:DataGrid> <br /><br /> <asp:Button id="Button1" Text="Select Item 5" OnClick="Select_Button_Click" runat="server"/> <asp:Button id="Button2" Text="Unselect Item" OnClick="UnSelect_Button_Click" runat="server"/> <br /><br /> <asp:Label id="Label1" runat="server"/> </form> </body> </html>
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.
