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How to add new Column in excel File using oledb in .net

Here is the code :-


  OleDbConnection vConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:\\information.xls;Extended Properties=Excel 12.0");
            vConn.Open();
            try
            {
                String rQLlll = "DROP TABLE NewTempTable ;";
                OleDbCommand mdd = new OleDbCommand(rQLlll, vConn);
                mdd.ExecuteNonQuery();
            }
            catch
            {
            }
            String strSQL = "SELECT NULL as thuluuuuu,* INTO NewTempTable FROM [data$];";
            OleDbCommand cmd = new OleDbCommand(strSQL, vConn);
            cmd.ExecuteNonQuery();
            try
            {
                String strSQLl = "DROP TABLE [data$];";
                OleDbCommand cmdd = new OleDbCommand(strSQLl, vConn);
                cmdd.ExecuteNonQuery();

                String rSQLlll = "DROP TABLE data ;";
                OleDbCommand mddd = new OleDbCommand(rSQLlll, vConn);
                mddd.ExecuteNonQuery();

            }
            catch
            {

            }
            String strSQLll = "SELECT * INTO data FROM [NewTempTable$];";
            OleDbCommand cmddd = new OleDbCommand(strSQLll, vConn);
            cmddd.ExecuteNonQuery();

            try
            {
                String strSQLlll = "DROP TABLE [NewTempTable$] ;";
                OleDbCommand cmdddd = new OleDbCommand(strSQLlll, vConn);
                cmdddd.ExecuteNonQuery();

                String rQLlll = "DROP TABLE NewTempTable ;";
                OleDbCommand mdd = new OleDbCommand(rQLlll, vConn);
                mdd.ExecuteNonQuery();
            }
            catch
            {

            }
            MessageBox.Show("inserted");
            vConn.Close();

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