SPSiteDataQuery to get data from multiple lists in site collection level in sharepoint 2013

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

namespace SPListDataQuery.ListDataQuery
{
    [ToolboxItemAttribute(false)]
    public class ListDataQuery : WebPart
    {
        private GridView grid;
        private GridView myGrid;
        private TextBox txtbox;
        protected override void CreateChildControls()
        {
            this.grid = new GridView();
            this.Controls.Add(this.grid);

            this.myGrid = new GridView();
            this.Controls.Add(this.myGrid);

            this.txtbox = new TextBox();
            this.Controls.Add(this.txtbox);
        }

        protected override void RenderContents(HtmlTextWriter writer)
        {
            base.RenderContents(writer);
            using(SPSite spsite=new SPSite("http://c4968397007/"))
            {
                using (SPWeb oweb = spsite.OpenWeb())
                {
                    SPSiteDataQuery query = new SPSiteDataQuery();
                    query.Lists = "<Lists ServerTemplate=\"105\" />";
                    query.ViewFields = "<FieldRef Name=\"Title\" />" +
                           "<FieldRef Name=\"FirstName\" Nullable=\"TRUE\" Type=\"Text\"/>" +
                           "<FieldRef Name=\"Company\" Nullable=\"TRUE\" Type=\"Text\"/>";
                             
                    query.Webs = "<Webs Scope=\"SiteCollection\" />";
                    DataTable dt = oweb.GetSiteData(query);
                    DataView dv = new DataView(dt);

                    BoundField boundField = new BoundField();

                    boundField.HeaderText = "Last Name";
                    boundField.DataField = "Title";
                    this.grid.Columns.Add(boundField);

                    boundField = new BoundField();
                    boundField.HeaderText = "First Name";
                    boundField.DataField = "FirstName";
                    this.grid.Columns.Add(boundField);

                    boundField = new BoundField();
                    boundField.HeaderText = "Company";
                    boundField.DataField = "Company";
                    this.grid.Columns.Add(boundField);

                    this.grid.AutoGenerateColumns = false;
                    this.grid.DataSource = dv;
                    this.grid.DataBind();

                    this.grid.AllowSorting = true;
                    this.grid.HeaderStyle.Font.Bold = true;
                    this.grid.RenderControl(writer);


                 
                 
                }
            }
        }
    }
}