Showing the SpGridView Version 2010 same like SpGridView Version 2007

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

namespace PrasadVWebPart.PrasadVWebPart
{
    [ToolboxItemAttribute(false)]
    public class PrasadVWebPart : WebPart
    {
        string strError = string.Empty;
        SPGridView sgvTasks;
        protected override void Render(HtmlTextWriter writer)
        {
            writer.Write(strError);
            try
            {
                writer.Write("<Style type='Text/Css'>");
                writer.Write(".GridClass");
                writer.Write("{");
                writer.Write("text-Align:Left;font-Weight:bold;");
                writer.Write("}");
                writer.Write("</Style>");
                sgvTasks.RenderControl(writer);
            }
            catch (Exception ex)
            {

                writer.Write(ex.ToString());
            }
        }
        protected override void CreateChildControls()
        {
            try
            {
                sgvTasks = new SPGridView();
                sgvTasks.ID = "sgvTasks";
                sgvTasks.AutoGenerateColumns = false;
                this.Controls.Add(sgvTasks);

                SPWeb currentWeb = SPContext.Current.Web;
                HyperLinkField hTaskName = new HyperLinkField();
                hTaskName.HeaderStyle.CssClass = "GridClass";
                hTaskName.HeaderText = "Task Name";
                hTaskName.DataNavigateUrlFields = new String[] { "ID" };
                hTaskName.DataTextField = "Title";
                hTaskName.DataNavigateUrlFormatString = currentWeb.Url + "/Lists/Tasks/DispForm.aspx?ID={0}&Source=" + Page.Request.Url;
                sgvTasks.Columns.Add(hTaskName);

                BoundField bStatus = new BoundField();
                bStatus.HeaderStyle.CssClass = "GridClass";
                bStatus.HeaderText = "Status";
                bStatus.DataField = "Status";
                sgvTasks.Columns.Add(bStatus);

                BoundField bPriority = new BoundField();
                bPriority.HeaderStyle.CssClass = "GridClass";
                bPriority.HeaderText = "Priority";
                bPriority.DataField = "Priority";
                sgvTasks.Columns.Add(bPriority);

                BoundField bCreatedDate = new BoundField();
                bCreatedDate.HeaderStyle.CssClass = "GridClass";
                bCreatedDate.HeaderText = "Created Date";
                bCreatedDate.DataField = "Created";
                bCreatedDate.DataFormatString = "{0:dd-MMM-yyyy}";
                sgvTasks.Columns.Add(bCreatedDate);
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    SPList lstTasks = currentWeb.Lists["Tasks"];
                    SPQuery sQuery = new SPQuery();
                    sQuery.Query = "<OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy>";
                    sQuery.ViewFields = "<FieldRef Name='Title' /><FieldRef Name='Priority' /><FieldRef Name='Status' /><FieldRef Name='Created' /><FieldRef Name='ID' />";
                    sQuery.ViewFieldsOnly = true;
                    SPListItemCollection TasksColl = lstTasks.GetItems(sQuery);
                    if (TasksColl.Count > 0)
                    {
                        sgvTasks.DataSource = TasksColl.GetDataTable();
                        sgvTasks.DataBind();
                    }
                });
            }
            catch (Exception ex)
            {
                strError += ex.ToString();
            }
        }
    }
}