How to append one datatable to another datatable?

dtab = clsUtility.SqlDataAdapter("select jj.JudgmentID from R_judgmentjudge jj inner join M_Judgmentjudges j on jj.JudgeID=j.JudgeID  Where j.JudgeID=" + JID + " order by jj.JudgmentID Desc" );

       tbcHeadNote.TabPages[0].Text = "HeadNote(" + dtab.Rows.Count + ")";
       tbcHeadNote.TabPages[0].Select();
       tbcHeadNote.SelectedTab = this.tbcHeadNote.TabPages[0];
       DataTable  dta=new DataTable();
       for (int i = 0; i < dtab.Rows.Count; i++)
       {
           try
           {
               String SQL = "SELECT   distinct (M_Statute.StatuteID),Convert(nvarchar(max),R_JudgmentStatute.Subject,103) as Subject, R_JudgmentNew.Appellants, R_JudgmentNew.Respondents, R_JudgmentNew.PageNo,M_JudgmentType.Abbrebiation,Case R_JudgmentNew.PubID WHEN 1 THEN 'PLJR' ELSE 'JLJR' END as Pub , R_JudgmentNew.VolYear as VolYearID, R_JudgmentNew.Vol,M_Year_1.Years as StYears,M_Year.Years AS volYear, M_Statute.StatuteName,R_JudgmentNew.JudgmentID   FROM  M_Statute INNER JOIN R_JudgmentStatute ON M_Statute.StatuteID = R_JudgmentStatute.StatuteID INNER JOIN R_JudgmentNew ON R_JudgmentStatute.JudgmentID = R_JudgmentNew.JudgmentID INNER JOIN M_JudgmentType ON R_JudgmentNew.JudgmentType = M_JudgmentType.JudgmentTypeID INNER JOIN M_Year ON R_JudgmentNew.VolYear = M_Year.YearID left outer join M_Year as M_Year_1 ON M_Statute.YearID = M_Year_1.YearID "

               SQL += "Where R_JudgmentNew.JudgmentID=" + Convert.ToInt32(dtab.Rows[0][0].ToString()) + "";

               dta = clsUtility.SqlDataAdapter(SQL);

             dt1.Merge(dta);
           }
           catch(Exception ex)
           {
           }


 }