i need to insert 180 records using bulk insert, but for every 30 records need to increment id,
 protected void Button2_Click(object sender, EventArgs e)
    {
        // String strConnection = "Data Source=(LocalDB)\v11.0;AttachDbFilename=ChitFund-DataBase.mdf;Integrated Security=True";
        DataTable dt = new DataTable();
        dt.Columns.Add("INITIATE_SEQUENCE", typeof(string));
        dt.Columns.Add("INITIATE_CHITNO", typeof(string));
        dt.Columns.Add("INITIATE_YEAR", typeof(int));
        dt.Columns.Add("INITIATE_MONTH", typeof(string));
        dt.Columns.Add("INITIATE_TOTALMONTH", typeof(string));
        dt.Columns.Add("INITIATE_CLIENTS", typeof(string));
        dt.Columns.Add("INITIATE_AMOUNT", typeof(int));
        dt.Columns.Add("INITIATE_INST", typeof(int));
        dt.Columns.Add("INITIATE_CUSTOMER", typeof(string));
        dt.Columns.Add("INITIATE_installment", typeof(int));
        dt.Columns.Add("INITIATE_STATUS", typeof(int));
        for (int i = 0; i <= 2; i++ )
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                string INITIATE_SEQUENCE = row.Cells[0].Text;
                string INITIATE_CHITNO = row.Cells[1].Text;
                int INITIATE_YEAR = int.Parse(row.Cells[2].Text);
                string INITIATE_MONTH = row.Cells[3].Text;
                string INITIATE_TOTALMONTH = row.Cells[4].Text;
                string INITIATE_CLIENTS = row.Cells[5].Text;
                int INITIATE_AMOUNT = int.Parse(row.Cells[6].Text);
                int INITIATE_INST = int.Parse(row.Cells[7].Text);
                string INITIATE_CUSTOMER = row.Cells[8].Text;            
                int INITIATE_installment = int.Parse(row.Cells[9].Text);              
                int INITIATE_STATUS = int.Parse(row.Cells[10].Text);
                dt.Rows.Add(INITIATE_SEQUENCE, INITIATE_CHITNO, INITIATE_YEAR, INITIATE_MONTH, INITIATE_TOTALMONTH, INITIATE_CLIENTS, INITIATE_AMOUNT, INITIATE_INST, INITIATE_CUSTOMER, INITIATE_installment, INITIATE_STATUS);
            }
            //using (SqlConnection con = new SqlConnection(strConnection))
            //{
            //    con.Open();
            //    SqlBulkCopy sqlBulk = new SqlBulkCopy(strConnection);
            //    //Give your Destination table name
            //    sqlBulk.DestinationTableName = "TBL_INITIATE";
            //    sqlBulk.WriteToServer(dt);
            //    con.Close();
            //}
            using (SqlConnection con = new SqlConnection(strConnection))
            {
                con.Open();
                SqlBulkCopy sqlBulk = new SqlBulkCopy(strConnection);
                //Give your Destination table name
                sqlBulk.DestinationTableName = "TBL_INITIATE2";
                sqlBulk.WriteToServer(dt);
                con.Close();
            }
            lblMsg.Text = "Details Inserted Successfully";
            lblMsg.ForeColor = System.Drawing.Color.Green;
        }
    }