Retrieving Documents from Folders and SubFolders within a SharePoint Document Library and Binding to SpGridView without a Single line of Loop.

Ascx Code

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>

<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>

<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>

<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, 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=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="VisualWebPart1UserControl.ascx.cs" Inherits="RetrieveDocuments.VisualWebPart1.VisualWebPart1UserControl" %>

<SharePoint:SPGridView ID="sgvMyDocuments" runat="server" AutoGenerateColumns="false">

<Columns>

<asp:HyperLinkField HeaderText="Document Name" DataTextField="LinkFilename" DataNavigateUrlFields="EncodedAbsUrl" DataNavigateUrlFormatString="{0}" Target="_blank" />

</Columns>

</SharePoint:SPGridView>

CS Code
try

            {

                SPSecurity.RunWithElevatedPrivileges(delegate()

                {

                    SPWeb currentWeb = SPContext.Current.Web;

                    SPDocumentLibrary lst = (SPDocumentLibrary)currentWeb.Lists["My Documents"];

                    SPQuery sQuery = new SPQuery();

                    sQuery.Query = "<OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy>";

                    sQuery.ViewFields = "<FieldRef Name='EncodedAbsUrl' /><FieldRef Name='LinkFilename' />";

                    sQuery.ViewAttributes = "Scope='Recursive'";

                    sQuery.ViewFieldsOnly = true;

                    SPListItemCollection myColl = lst.GetItems(sQuery);

                    if (myColl.Count > 0)

                    {

                        sgvMyDocuments.DataSource = myColl.GetDataTable();

                        sgvMyDocuments.DataBind();

                    }

                });

            }

            catch (Exception ex)

            {

                Response.Write(ex.ToString());

            }

        }

Note:-

     In SharePoint 2007 You will not have a ViewFieldsOnly Attribute for SpQuery.

Here in this code EncodedAbsUrl is a default SharePoint Column which is carrying the File URL in SharePoint Document Library.