Export (0) Print
Expand All

GridView.SelectedIndex Property

Gets or sets the index of the selected row in a GridView control.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

[BindableAttribute(true)]
public virtual int SelectedIndex { get; set; }
<asp:GridView SelectedIndex="Int32" />

Property Value

Type: System.Int32
The zero-based index of the selected row in a GridView control. The default is -1, which indicates that no row is currently selected.

ExceptionCondition
ArgumentOutOfRangeException

The SelectedIndex property is set to a value less than -1.

Use the SelectedIndex property to determine the index of the currently selected row in a GridView control. You can also use this property to programmatically select a row in the control. To clear the selection of a row, set this property to -1. The appearance of the currently selected row can be customized by using the SelectedRowStyle property. To access the currently selected row, use the SelectedRow property.

The following example demonstrates how to use the SelectedIndex property to select the second row in a GridView control when the control is initially displayed.

<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void CustomersGridView_SelectedIndexChanged(Object sender, EventArgs e)
  {

    // Get the currently selected row using the SelectedRow property.
    GridViewRow row = CustomersGridView.SelectedRow;

    // Display the company name from the selected row. 
    // In this example, the third column (index 2) contains 
    // the company name.
    MessageLabel.Text = "You selected " + row.Cells[2].Text + ".";

  }

  void CustomersGridView_SelectedIndexChanging(Object sender, GridViewSelectEventArgs e)
  {

    // Get the currently selected row. Because the SelectedIndexChanging event 
    // occurs before the select operation in the GridView control, the 
    // SelectedRow property cannot be used. Instead, use the Rows collection 
    // and the NewSelectedIndex property of the e argument passed to this  
    // event handler.
    GridViewRow row = CustomersGridView.Rows[e.NewSelectedIndex];

    // You can cancel the select operation by using the Cancel 
    // property. For this example, if the user selects a customer with  
    // the ID "ANATR", the select operation is canceled and an error message
    // is displayed. 
    if (row.Cells[1].Text == "ANATR")
    {

      e.Cancel = true;
      MessageLabel.Text = "You cannot select " + row.Cells[2].Text + ".";

    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView Select Example</title>
</head>
<body>
    <form id="form1" runat="server">

     <h3>GridView Select Example</h3>

     <asp:gridview id="CustomersGridView" 
       datasourceid="CustomersSource" 
       autogeneratecolumns="False"
       autogenerateselectbutton="True"
       allowpaging="True" 
       selectedindex="1"
       onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
       onselectedindexchanging="CustomersGridView_SelectedIndexChanging"   
       runat="server" DataKeyNames="CustomerID">

         <Columns>
             <asp:BoundField DataField="CustomerID" 
                 HeaderText="CustomerID" 
                 InsertVisible="False" ReadOnly="True" 
                 SortExpression="CustomerID" />
             <asp:BoundField DataField="FirstName" 
                 HeaderText="FirstName" 
                 SortExpression="FirstName" />
             <asp:BoundField DataField="MiddleName" 
                 HeaderText="MiddleName" 
                 SortExpression="MiddleName" />
             <asp:BoundField DataField="LastName" 
                 HeaderText="LastName" 
                 SortExpression="LastName" />
             <asp:BoundField DataField="Phone" 
                 HeaderText="Phone" 
                 SortExpression="Phone" />
         </Columns>

       <selectedrowstyle backcolor="LightCyan"
         forecolor="DarkBlue"
         font-bold="true"/>  

     </asp:gridview>

      <br/>

      <asp:label id="MessageLabel"
        forecolor="Red"
        runat="server"/>

      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSource"
        selectcommand="SELECT CustomerID, FirstName, MiddleName, LastName, Phone FROM SalesLT.Customer"
        connectionstring="<%$ ConnectionStrings:AdventureWorksLTConnectionString %>" 
        runat="server"/>

    </form>
  </body>
</html>

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

Community Additions

ADD
Show:
© 2014 Microsoft