how to appned two or more tables in grid view from data set or data table

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C#

ASP.NET

Hi,
I want to appned the gridview data with some more data .
i am using this code-

{
        string startdate = "";
        //string todate = "";
        DataTable objDt = null;
        
        try
        {
            DateTime fromdate = DateTime.Parse(txtfromdate.Text.Trim());
            DateTime todate = DateTime.Parse(txttodate.Text.Trim());
            TimeSpan ts = todate.Subtract(fromdate);
            string i = ts.Days.ToString();
            int[] values = new int[Convert.ToInt32(i)];
                        
            for (int j = 0; j <= Convert.ToInt32(i); j++)
            {
                fromdate = fromdate.AddDays(j);

                DBClass objDBClass = new DBClass();
                objDt = new DataTable();               
                //DateTime start = DateTime.Parse(txtfromdate.Text.Trim());
                startdate = fromdate.ToString("yyyy/MM/dd");
                objDt = objDBClass.Getdefaulterlist(startdate);
               
                if (objDt.Rows.Count > 0)
                {
                 
                    dgdefaulertlist.DataSource = objDt;
                    
                    dgdefaulertlist.DataBind();      
                   
                                        
                }
                else
                {
                    lblmsg.Text = "No Record Found";
                    dgdefaulertlist.DataSource = null;
                    dgdefaulertlist.DataBind();
                }
                fromdate =DateTime.Parse(txtfromdate.Text.Trim());
            }
         } 

the data is override .i want to append the data .

Thanks in Advance