C# + Oracle.DataAccess.Client - not responding executing sql update statement

Question

I'm trying to update some fields(previously selected and displayed in DataGridView). For some reason WinForms application not responding when i'm trying to execute sql update statement (ExecuteNonQuery). Anything wrong with my code?

private void button19_Click(object sender, EventArgs e)
    {        
        if (ora_dataset.Tables["SWAP_2G_CELLS"].Rows.Count > 0)
        {
           foreach (DataRow row in ora_dataset.Tables["SWAP_2G_CELLS"].Rows)
           {
               string swap = row.ItemArray[13].ToString();
               string flag = row.ItemArray[14].ToString();
               string data = row.ItemArray[15].ToString();

               string sql_update = System.IO.File.ReadAllText("SQL/SWAP/swap_2g_update.dat");

               sql_update = sql_update.Replace("%SWAP_PARAM%", swap);
               sql_update = sql_update.Replace("%FLAG_PARAM%", flag);
               sql_update = sql_update.Replace("%DATE_PARAM%", data);
               sql_update = sql_update.Replace("%SITE_ID_PARAM%", row.ItemArray[1].ToString());
               sql_update = sql_update.Replace("%LAC_PARAM%", row.ItemArray[7].ToString());

               OracleCommand cmd = new OracleCommand();
               OracleConnection con = new OracleConnection(connstring);
               cmd.Connection = con;
               //cmd.CommandType = CommandType.Text;
               cmd.CommandText = sql_update;
               cmd.Connection.Open();
               int count = cmd.ExecuteNonQuery();
               cmd.Connection.Close();
               cmd.Dispose();
           }
        }

After parameters replacement sql string looks like this for first row in my dataset:

UPDATE SWAP_2G
SET 
SWAP = 'P'
,FLAG1 = '1'
,DATA_SWAP = TO_DATE('12-02-15 00:00:00', 'dd-mm-yy hh24:mi:ss')
WHERE SITE_ID = '2664' AND LAC LIKE '39002'

I'm trying to execute it with Oracle SQL Developer, and it's work fine.

Answer 1

Waitting for answers