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Try using this Example :

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

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 + ".";

}

}

<title>GridView Select Example

GridView Select Example

<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">

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

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

<asp:sqldatasource id="CustomersSource"
="" selectcommand="SELECT CustomerID, FirstName, MiddleName, LastName, Phone FROM SalesLT.Customer" connectionstring="<%$ ConnectionStrings:AdventureWorksLTConnectionString %>" runat="server">

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.