Getting selected row data from gridview in multiple way

 It is common requirement when we work in a single page means when our input parameters and display records from database in a gridview and we have to get data from selected row to manipulate.

 Table Design

Design View (Source code)

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="FrmGetGridViewValue.aspx.cs" Inherits="FrmGetGridViewValue" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">
    <style type="text/css">
    .style1
    {
        width: 100%;
    }
</style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">

    <table class="style1">
    <tr>
        <td>
            &nbsp;</td>
    </tr>
    <tr>
        <td>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                onselectedindexchanged="GridView1_SelectedIndexChanged"
                onrowcommand="GridView1_RowCommand">
                <Columns>
               
                    <asp:BoundField DataField="id" HeaderText="ID" />
                    <asp:BoundField DataField="name" HeaderText="Name" />
                   <asp:CommandField ShowSelectButton="True" HeaderText="CommandField"/>
                    <asp:TemplateField HeaderText="LinkButton">
                        <ItemTemplate>
                            <asp:LinkButton ID="LnkSelect" runat="server" CommandName="link">Select</asp:LinkButton>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>
        </td>
    </tr>
     <tr>
        <td>
            <asp:Label ID="Label1" runat="server" Text="ID"></asp:Label>
            &nbsp;&nbsp;&nbsp;&nbsp;
            &nbsp;              <asp:TextBox ID="txtid" runat="server"></asp:TextBox>
         </td>
    </tr>
     <tr>
        <td>
            <asp:Label ID="Label2" runat="server" Text="Name"></asp:Label>
            &nbsp;<asp:TextBox ID="txtname" runat="server"></asp:TextBox>
         </td>
    </tr>
</table>

</asp:Content>

C# Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class FrmGetGridViewValue : System.Web.UI.Page
{
    SqlConnection con;
    SqlDataAdapter da;
    DataSet ds;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack == false)
        {
            con = new SqlConnection(ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString);
            string x = "select * from st1";
            da = new SqlDataAdapter(x,con);
            ds = new DataSet();
            da.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }
    }
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        txtid.Text = GridView1.SelectedRow.Cells[0].Text;
        txtname.Text = GridView1.SelectedRow.Cells[1].Text;
    }
  
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "link")
        {

            GridViewRow val = (GridViewRow)((LinkButton)e.CommandSource).NamingContainer;
            int RowIndex = val.RowIndex;

            txtid.Text = GridView1.Rows[RowIndex].Cells[0].Text;
            txtname.Text = GridView1.Rows[RowIndex].Cells[1].Text;
        }
    }
}