Recep Güzel

        protected ListViewByQuery viewByQuery = null ;
        protected EncodedLiteral encodedLiteral = null;
        protected override void CreateChildControls()
        {
            SPSite site = null ;
            SPWeb web = null ;
            this .siteUrl = "Http://intranet" ;
            this .sourceList = "Grup Duyuruları" ;
            site = new SPSite ( this.SiteUrl);
            web = site.OpenWeb();
            SPList sourceList = web.Lists[this .SourceList];
            viewByQuery = new ListViewByQuery ();
            SPQuery query = null ;
            viewByQuery.List = sourceList;
            query = new SPQuery (viewByQuery.List.DefaultView);
            viewByQuery.Query = query;
            this .Controls.Add(viewByQuery);
        }

#region using statements

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Runtime.InteropServices;
using System.Xml.Serialization;
using System.Text;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
#endregion

namespace gosterici2.VisualWebPart1
{
    [ToolboxItemAttribute(false)]
    public class VisualWebPart1 : System.Web.UI.WebControls.WebParts.WebPart
    {
        // Visual Studio might automatically update this path when you change the Visual Web Part project item.
        private const string _ascxPath = @"~/_CONTROLTEMPLATES/gosterici2/gosterici2/gostericiII.ascx";

        #region protected child control variable definitions
        protected ListViewByQuery viewByQuery = null;
        protected EncodedLiteral encodedLiteral = null;
        #endregion

        #region webpart properties
        /// <summary>
        /// 
        /// </summary>
        private string viewNameField = string.Empty;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("View Name"), WebDescription("View Name")]
        public string ViewName
        {
            get
            {
                return this.viewNameField;
            }
            set
            {
                this.viewNameField = value;
            }
        }
        
        /**********************************************************/
        /*Bir webparta property tanımlamak için gerekli kod*******/
        private string recepField = string.Empty;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("İsminiz"), WebDescription("Adınızı yazınız")]
        public string RecepField
        {
            get
            {
                return this.recepField;
            }
            set
            {
                this.recepField = value;
            }
        }
        /**********************************************************/


        private string siteUrlField = string.Empty;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("Site Url"), WebDescription("Site Url")]
        public string SiteUrl
        {
            get
            {
                return this.siteUrlField;
            }
            set
            {
                this.siteUrlField = value;
            }
        }
        /// <summary>
        /// 
        /// </summary>
        private string sourceListField = string.Empty;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("Source List"), WebDescription("Source list to query")]
        public string SourceList
        {
            get
            {
                return this.sourceListField;
            }
            set
            {
                this.sourceListField = value;
            }
        }
        private Boolean disableFilterField = false;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("Disable Filter"), WebDescription("Disable List Filtering")]
        public Boolean DisableFilter
        {
            get
            {
                return disableFilterField;
            }
            set
            {
                disableFilterField = value;
            }
        }
        private Boolean disableSortField = false;
        [Personalizable(), WebPartStorage(Storage.Shared), WebBrowsable(),
         WebDisplayName("Disable Sort"), WebDescription("Disable list sorting")]
        public Boolean DisableSort
        {
            get
            {
                return disableSortField;
            }
            set
            {
                this.disableSortField = value;
            }
        }
        #endregion

        #region overrides
        protected override void CreateChildControls()
        {
            base.CreateChildControls();
            SPSite site = null;
            SPWeb web = null;
            Boolean disposeSPSite = false;
            try
            {
                if (this.SourceList != string.Empty)
                {
                    viewByQuery = new ListViewByQuery();
                    if (this.SiteUrl != null && this.SiteUrl != string.Empty)
                    {
                        site = new SPSite(this.SiteUrl);
                        disposeSPSite = true;
                    }
                    else
                    {
                        site = SPContext.Current.Site;
                    }
                    web = site.OpenWeb();
                    SPList sourceList = web.Lists[this.SourceList];
                    viewByQuery.List = sourceList;
                    SPQuery query = null;
                    if (CheckIfViewExists(viewByQuery.List))
                    {
                        //use the view specified in webpart property
                        query = new SPQuery(viewByQuery.List.Views[this.ViewName]);
                    }
                    else
                    {
                        //use default view to initialized
                        query = new SPQuery(viewByQuery.List.DefaultView);
                    }
                    viewByQuery.Query = query;
                    viewByQuery.DisableFilter = this.DisableFilter;
                    viewByQuery.DisableSort = this.DisableSort;
                    
                    this.Controls.Add(viewByQuery);
                }
                else
                {
                    encodedLiteral = new EncodedLiteral();
                    encodedLiteral.Text = "This webpart is not configured.";
                    this.Controls.Add(encodedLiteral);
                }
            }
            finally
            {
                if (disposeSPSite)
                {
                    ((IDisposable)site).Dispose();
                    ((IDisposable)web).Dispose();
                }
            }
        }
        protected override void RenderContents(HtmlTextWriter writer)
        {
            EnsureChildControls();
            RenderChildren(writer);
        }
        #endregion

        #region helper methods
        private Boolean CheckIfViewExists(SPList list)
        {
            Boolean ret = false;
            foreach (SPView view in list.Views)
            {
                if (view.Title.ToLower() == this.ViewName.ToLower())
                {
                    ret = true;
                }
            }
            return ret;
        }
        #endregion
    }
}

Kaynak:http://blogs.msdn.com/b/ramg/archive/2009/04/22/implementing-a-simple-cross-site-collection-list-view-webpart.aspx