My First WebPart in SharePoint 2013

Ascx

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %> <%@ Assembly Name="Microsoft.Web.CommandUI, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> <%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> <%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> <%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %> <%@ Import Namespace="Microsoft.SharePoint" %> <%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> <%@ Control Language="C#" AutoEventWireup="true" CodeBehind="TestSp2013.ascx.cs" Inherits="TestSp2013.TestSp2013.TestSp2013" %> <asp:GridView ID="dgvTasks" runat="server" CellPadding="4" ForeColor="#333333" AutoGenerateColumns="False" width="100%">     <AlternatingRowStyle BackColor="White" />     <EditRowStyle BackColor="#2461BF" />     <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />     <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />     <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />     <RowStyle BackColor="#EFF3FB" />     <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />     <sortedascendingcellstyle backcolor="#F5F7FB" />     <sortedascendingheaderstyle backcolor="#6D95E1" />     <sorteddescendingcellstyle backcolor="#E9EBEF" />     <sorteddescendingheaderstyle backcolor="#4870BE" />     <columns>         <asp:BoundField DataField="Title" HeaderText="Title"></asp:BoundField>         <asp:BoundField DataField="Status" HeaderText="Status"></asp:BoundField>         <asp:BoundField DataField="Priority" HeaderText="Priority"></asp:BoundField>         <asp:BoundField DataField="StartDate" DataFormatString="{0:G}" HeaderText="Start Date"></asp:BoundField>         <asp:BoundField DataField="DueDate" DataFormatString="{0:G}" HeaderText="End Date"></asp:BoundField>         <asp:BoundField DataField="AssignedTo" HeaderText="Assigned To"></asp:BoundField>     </columns> </asp:GridView>

Ascx.cs

using System; using System.ComponentModel; using System.Web.UI.WebControls.WebParts; using Microsoft.SharePoint; using System.Security; namespace TestSp2013.TestSp2013 {     [ToolboxItemAttribute(false)]     public partial class TestSp2013 : WebPart     {         public TestSp2013()         {         }         protected override void OnInit(EventArgs e)         {             base.OnInit(e);             InitializeControl();         }         protected void Page_Load(object sender, EventArgs e)         {             if (!Page.IsPostBack)             {                 GetData();             }         }         public void GetData()         {             try             {                 SPSecurity.RunWithElevatedPrivileges(delegate()                 {                     SPQuery sQuery = new SPQuery();                     sQuery.Query = "<OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy>";                     SPListItemCollection myColl = SPContext.Current.Web.Lists["Tasks"].GetItems(sQuery);                     if (myColl.Count > 0)                     {                         dgvTasks.DataSource = myColl.GetDataTable();                         dgvTasks.DataBind();                     }                 });             }             catch (Exception Ex)             {                 Page.Response.Write(Ex.ToString());             }         }     } }