From excell to MySQL database

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C#3.5

I am trying to import data from Excel to Mysql database
Here is my code:

C# part:

private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            string putanjaExH = tbH.Text;
            string putanjaExE = tbE.Text;
            
           
                if (putanjaExH != "")
                {
                    var wbh = new XLWorkbook(putanjaExH);
                    var wsh = wbh.Worksheet("Sheet1");
                    bool ide = true;
                    int ih = 5;
                    
                        while (ide)
                        {
                            HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create("http://admin.apartman-donat.com/refu.php");
                            ASCIIEncoding encoding = new ASCIIEncoding();
                            string postData = "insert into refh (Gizrade, Investitor, Radni_Zadatak, Predmet_ projekta, Vrsta_projekta_K, Vrsta_projekta_O) values (N'" + wsh.Cell(ih, 1).Value.ToString().Replace(".", "") + "', N'" + wsh.Cell(ih, 2).Value + "', N'" + wsh.Cell(ih, 3).Value + "', N'" + wsh.Cell(ih, 4).Value + "', N'" + wsh.Cell(ih, 5).Value + "', N'" + wsh.Cell(ih, 6).Value + "')";
                            byte[] data = encoding.GetBytes(postData);
                            httpWReq.Method = "POST";
                            httpWReq.ContentLength = data.Length;
                            using (Stream newStream = httpWReq.GetRequestStream())
                            {
                                newStream.Write(data, 0, data.Length);
                            }
                            WebResponse response = httpWReq.GetResponse();
                            // Display the status.
                            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
                            // Get the stream containing content returned by the server.
                            Stream dataStream = response.GetResponseStream();
                            // Open the stream using a StreamReader for easy access.
                            StreamReader reader = new StreamReader(dataStream);
                            // Read the content.
                            string responseFromServer = reader.ReadToEnd();
                            // Display the content.
                            MessageBox.Show(responseFromServer);
                            // Clean up the streams.
                            reader.Close();
                            dataStream.Close();
                            response.Close();



                            ih = ih + 1;
                            if (wsh.Cell(ih,1).Value=="")
                            {
                                ide = false;
                            }
                         }
                }
                this.Close();
        }

PHP part:

<?php
$con = mysql_connect("localhost","test_ref","test");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("refh", $con);

$sql='$_POST[httpWReq]'

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }

echo "1 record added";

mysql_close($con);
?>

response is:
lt;br> Parse error</br> : Syntax error: unexpected T_IF in .....

Could someone tell me what am I doing wrong?????