Gets or sets the index of the selected row in a GridView control.
<BindableAttribute(True)> _ Public Overridable Property SelectedIndex As Integer
Dim instance As GridView Dim value As Integer value = instance.SelectedIndex instance.SelectedIndex = value
[BindableAttribute(true)] public virtual int SelectedIndex { get; set; }
[BindableAttribute(true)] public: virtual property int SelectedIndex { int get (); void set (int value); }
public function get SelectedIndex () : int public function set SelectedIndex (value : int)
<asp:GridView SelectedIndex="Int32" />
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="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Sub CustomersGridView_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) ' Get the currently selected row using the SelectedRow property. Dim row As GridViewRow = CustomersGridView.SelectedRow ' Display the company name from the selected row. ' In this example, the third column (index 2) contains ' the company name. Message.Text = "You selected " & row.Cells(2).Text & "." End Sub Sub CustomersGridView_SelectedIndexChanging(ByVal sender As Object, ByVal e As GridViewSelectEventArgs) ' 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. Dim row As GridViewRow = 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" Then e.Cancel = True Message.Text = "You cannot select " + row.Cells(2).Text & "." End If End Sub </script> <html > <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="true" autogenerateselectbutton="true" allowpaging="true" selectedindex="0" onselectedindexchanged="CustomersGridView_SelectedIndexChanged" onselectedindexchanging="CustomersGridView_SelectedIndexChanging" runat="server"> <selectedrowstyle backcolor="LightCyan" forecolor="DarkBlue" font-bold="true"/> </asp:gridview> <br/> <asp:label id="Message" 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], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>
<%@ 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. Message.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; Message.Text = "You cannot select " + row.Cells[2].Text + "."; } } </script> <html > <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="true" autogenerateselectbutton="true" allowpaging="true" selectedindex="0" onselectedindexchanged="CustomersGridView_SelectedIndexChanged" onselectedindexchanging="CustomersGridView_SelectedIndexChanging" runat="server"> <selectedrowstyle backcolor="LightCyan" forecolor="DarkBlue" font-bold="true"/> </asp:gridview> <br/> <asp:label id="Message" 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], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>
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