Alternate Method For Gridview Edit, Delete?

<asp:GridView ID="gvDetails" AutoGenerateColumns="False" AllowPaging="True" PageSize="4"
    DataKeyNames="ID" runat="server" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None"
    BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Horizontal" OnPageIndexChanging="gvDetails_PageIndexChanging"
    OnRowCancelingEdit="gvDetails_RowCancelingEdit" OnRowEditing="gvDetails_RowEditing"
    OnRowUpdating="gvDetails_RowUpdating" OnRowDataBound="gvDetails_RowDataBound"
    OnRowDeleting="gvDetails_RowDeleting">
   <Columns>
    <asp:CommandField ButtonType="Link" HeaderText="Action" ShowEditButton="true" ShowDeleteButton="true"
        ShowCancelButton="true" />
        <asp:TemplateField HeaderText="Name">
    <EditItemTemplate>
        <asp:TextBox ID="TextBoxEditName" runat="server" Text='<%# Bind("Name") %>' />
    </EditItemTemplate>
    <ItemTemplate>
        <asp:Label ID="LabelName" runat="server" Text='<%# Bind("Name") %>' />
    </ItemTemplate>
    <FooterTemplate>
        <asp:TextBox ID="TextBoxName" runat="server" Text='<%# Bind("Name") %>' />
    </FooterTemplate>
</asp:TemplateField> 
   </Columns>
                        <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
                        <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
                        <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
                        <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
                    </asp:GridView>

{
    SqlCommand cmd, upd;
    SqlConnection con;
    SqlDataAdapter da;
    DataTable dt = new DataTable();

    protected void Page_Load(object sender, EventArgs e)
    {
        con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
        con.Open();
        if (Request.Cookies["Username"] == null || Request.Cookies["Password"] == null)
        {
            Response.Redirect("../../Registration/Login.aspx");
        }
        else
        {
            lblUser.Text = Request.Cookies["Username"].Value.ToString();
            lblUser.ForeColor = System.Drawing.Color.White;
            Session["Username"] = Request.Cookies["Username"].Value.ToString();
        }
        if (!IsPostBack)
        {
            bindresults();
            gvDetails.DataSource = dt;
            gvDetails.DataBind();
        }

    }
    public DataTable bindresults()
    {
        cmd = new SqlCommand("select * from Registration", con);
        da = new SqlDataAdapter(cmd);
        da.Fill(dt);
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
        return dt;
    }
    protected void gvDetails_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvDetails.PageIndex = e.NewPageIndex;
        bindresults();
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
    protected void gvDetails_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvDetails.EditIndex = e.NewEditIndex;
        bindresults();
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
    protected void gvDetails_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        gvDetails.EditIndex = -1;
        bindresults();
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
    protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        int ID = int.Parse(gvDetails.DataKeys[e.RowIndex].Value.ToString());
        //string Username = ((TextBox)gvDetails.Rows[e.RowIndex].Cells[0].FindControl("TextBoxEditUsername")).Text;
        string Name = ((TextBox)gvDetails.Rows[e.RowIndex].Cells[1].FindControl("TextBoxEditName")).Text;
        string Gender = ((TextBox)gvDetails.Rows[e.RowIndex].Cells[2].FindControl("TextBoxEditGender")).Text;
        string Occupation = ((TextBox)gvDetails.Rows[e.RowIndex].Cells[3].FindControl("TextBoxEditOccupation")).Text;
        string Address = ((TextBox)gvDetails.Rows[e.RowIndex].Cells[4].FindControl("TextBoxEditAddress")).Text;
        upd = new SqlCommand("update Registration set Name = '" + Name + "', Gender = '" + Gender + "', Occupation = '" + Occupation + "', Address = '" + Address + "' where ID = '" + ID + "'", con);
        upd.ExecuteNonQuery();
        gvDetails.EditIndex = -1;
        bindresults();
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
    protected void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int ID = int.Parse(gvDetails.DataKeys[e.RowIndex].Value.ToString());
        cmd = new SqlCommand("delete from Registration where ID = " + ID + "", con);
        cmd.ExecuteNonQuery();
        bindresults();
        gvDetails.DataSource = dt;
        gvDetails.DataBind();
    }
    protected void gvDetails_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (!DataBinder.Eval(e.Row.DataItem, "Username").Equals(Session["Username"].ToString()))
            {
                LinkButton btn = (LinkButton)e.Row.Cells[0].Controls[0];
                LinkButton btn1 = (LinkButton)e.Row.Cells[0].Controls[2];

                if (btn != null && btn1 != null)
                {
                    btn.Visible = false;
                    btn1.Visible = false;
                }
            }
        }
    }
}