Unable to insert data in database

string StrQuery;
            try
            {
                using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Demo_Data.mdf;Integrated Security=True;Connect Timeout=30"))
                {
                    using (SqlCommand comm = new SqlCommand())
                    {
                        comm.Connection = conn;
                        conn.Open();

                        for (int i = 0; i < dataGridView1.Rows.Count; i++)
                        {
                            StrQuery = @"INSERT INTO umrah (S#No#, Name, Code, Area, Sector, CNIC, TotalCoupen) VALUES ('"
                                
                                + dataGridView1.Rows[i].Cells["S#No#"].Value + "','"
                                + dataGridView1.Rows[i].Cells["Name"].Value + "','"
                                + dataGridView1.Rows[i].Cells["Code"].Value + "','"
                                + dataGridView1.Rows[i].Cells["Area"].Value + "','"
                                + dataGridView1.Rows[i].Cells["Sector"].Value + "','"
                                + dataGridView1.Rows[i].Cells["CNIC"].Value + "','"
                                + dataGridView1.Rows[i].Cells["TotalCoupen"].Value + "');";
                            comm.CommandText = StrQuery;
                            comm.ExecuteNonQuery();
                        }
                    }
                }
            }
            catch { }