Read the previous code snippet to edit/update in a GridView here. I have disabled AutoGenerateColumns and declared the columns explicitly.

In the below code snippet, I have made the delete button to appear as first column.

ASPX

 <asp:GridView ID="gvUsers" runat="server" AutoGenerateColumns="False" BackColor="White"

                BorderColor="#010101" BorderStyle="Groove" BorderWidth="1px" CellPadding="4"  OnRowDeleting="gvUsers_RowDeleting">

                    <Columns>

                     <asp:CommandField ShowDeleteButton="True" HeaderText="Delete" />         

                        <asp:BoundField DataField="Email" HeaderText="Email" ReadOnly="True" />

                        <asp:BoundField DataField="FirstName" HeaderText="First Name" ReadOnly="True" />

                        <asp:BoundField DataField="LastName" HeaderText="Last Name" ReadOnly="True" />    

                        <asp:BoundField DataField="DateOfBirth" HeaderText="DOB" ReadOnly="True" />

                        <asp:BoundField DataField="WebAddress" HeaderText="WebSite" ReadOnly="True" />

                        <asp:BoundField DataField="Blog" HeaderText="Blog" ReadOnly="True" />

                        <asp:BoundField DataField="Address1" HeaderText="Address1" ReadOnly="True" />

                        <asp:BoundField DataField="Address2" HeaderText="Address2" ReadOnly="True" />

                        <asp:BoundField DataField="City" HeaderText="City" ReadOnly="True" />    

                         <asp:BoundField DataField="State" HeaderText="State" ReadOnly="True" /> 

                          <asp:BoundField DataField="Country" HeaderText="Country" ReadOnly="True" /> 

                           <asp:BoundField DataField="PIN" HeaderText="PIN" ReadOnly="True"

                    </Columns>

                </asp:GridView>

CodeBehind

protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {          

            BindUsers();

        }

    }

  public void BindUsers()

    {

        DataTable dt = userDAO.GetUsersForVIEWEDITDEL();

        lblNoOfUsers.Text = "Total Number of Users: " + dt.Rows.Count;

        gvUsers.DataSource = dt;

        gvUsers.DataBind();

    }

    protected void gvUsers_RowDeleting(object sender, GridViewDeleteEventArgs e)

    {

        string Email = gvUsers.Rows[e.RowIndex].Cells[1].Text;

        userDAO.DeleteUser(Email);

        BindUsers();

    }