Here is sample code try this:
protected void savedatafromgv()
{
foreach (DataGridRows g1 in dg_AgentSFR.Rows)
{
SqlConnection con = new SqlConnection(strConnString);
SqlCommand cmd = con.CreateCommand();
cmd = new SqlCommand("INSERT INTO TB_TransAgenSeaFreightRate(POL,POD,FORWARDER,FORWARDER REFERENCE,SHIPPING LINE,CONTAINER TYPE,CONTAINER SIZE,VALIDITY FROM,VALIDITY TO,BASIC RATE,PAF,CAF,PSS,TOTAL AMOUNT,REE DAYS,CREDIT DAYS,NIT DEPOSIT,COMPANYID,ISACTIVE) values ('" + g1.Cells[0].Text + "','" + g1.Cells[1].Text + "','" + g1.Cells[2].Text + "','" + g1.Cells[3].Text + "','" + g1.Cells[4].Text + "','" + g1.Cells[5].Text + "','" + g1.Cells[6].Text + "','" + g1.Cells[7].Text + "','" + g1.Cells[8].Text + "','" + g1.Cells[9].Text + "','" + g1.Cells[10].Text + "','" + g1.Cells[11].Text + "','" + g1.Cells[12].Text + "','" + g1.Cells[13].Text + "','" + g1.Cells[14].Text + "','" + g1.Cells[15].Text + "','" + g1.Cells[16].Text + "',1,'" + TXTCompanyID.Text + "')", con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
Response.Write("Records inserted successfully");
}
to avoid sql injection use "cmd.parameter.add .................."