i want to upload my excel sheet into sql server database

try
        {
            string strXml = String.Empty;
            //DataTable _dtFinalCh = new DataTable();
            DataTable _dtFinal = new DataTable();

            _dtFinal = (DataTable)ViewState["dtExcelSheetName"];
           // DataTable _dtfinaldata = _dtFinal.AsEnumerable().Distinct().CopyToDataTable();
            if (_dtFinal != null && _dtFinal.Rows.Count > 0)
            {
                DataSet ds = new DataSet();
                ds.DataSetName = "DWR";
                ds.Tables.Add(_dtFinal);
                ds.Tables[0].TableName = "Insertxml";
                strXml = ds.GetXml();
            }
           
            GridView1.DataSource = dtExcelSheetName;
            GridView1.DataBind();
        }
        catch { }
 
     }