my Add button is not adding products to datagridview

Question

Hello guyz,

 

its me again please look at my codes and see why my add button is not adding the numbers to datagridview and i am not getting any error when i debug.

 

"it only underlines dr : SqlDataReader dr; It says "its never been used in frmNewBill"

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace NSPM_Sales_Invoice
{
public partial class frmNewBill : Form
{
SqlConnection con = new SqlConnection(Properties.Settings.Default.NSPM_Sales_InvoiceCon);
SqlCommand cmd;
SqlDataReader dr;
public frmNewBill()
{
InitializeComponent();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
}
private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
{
}
private void frmNewBill_Load(object sender, EventArgs e)
{
cmbDescription.Items.Clear();
con.Open();
cmd = con.CreateCommand();
cmd.CommandType= CommandType.Text;
cmd.CommandText = "Select ProName from tbl_Products order by ProName asc";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
cmbDescription.Items.Add(dr["ProName"].ToString());
}
con.Close();
}
private void btnAdd_Click(object sender, EventArgs e)
{
if (cmbDescription.Text == "")
{
MessageBox.Show("Description is Empty");
}
else if (txtQuantity.Text == "")
{
MessageBox.Show("Quantity is Empty");
}
else if (txtUnitPrice.Text == "")
{
MessageBox.Show("Unit Price is Empty");
}
else if (txtJobNo.Text == "")
{
MessageBox.Show("JobNo is Empty");
if (txtDeleteUpdate.Text == "")
{
int row = 0;
dataGridView1.Rows.Add();
row = dataGridView1.Rows.Count - 1;
dataGridView1["Description", row].Value = cmbDescription.Text;
dataGridView1["Quantity", row].Value = txtQuantity.Text;
dataGridView1["UnitPrice", row].Value = txtUnitPrice.Text;
dataGridView1["Value", row].Value = txtValue.Text;
dataGridView1["JobNo", row].Value = txtJobNo.Text;
dataGridView1.Refresh();
cmbDescription.Focus();
if (dataGridView1.Rows.Count > 0)
{
dataGridView1.CurrentCell = dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[1];
}
}
else
{
int i = 0;
DataGridViewRow row = dataGridView1.Rows[i];
row.Cells[1].Value = cmbDescription.Text;
row.Cells[2].Value = txtQuantity.Text;
row.Cells[3].Value = txtUnitPrice.Text;
row.Cells[4].Value = txtValue.Text;
}
cmbDescription.Text = "";
txtQuantity.Text = "";
txtUnitPrice.Text = "";
txtValue.Text = "";
txtJobNo.Text = "";
}
}
private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
this.dataGridView1.Rows[e.RowIndex].Cells[0].Value = (e.RowIndex + 1).ToString();
}
int i;
private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
i = e.RowIndex;
DataGridViewRow row = dataGridView1.Rows[i];
cmbDescription.Text = row.Cells[1].Value.ToString();
txtQuantity.Text = row.Cells[2].Value.ToString();
txtUnitPrice.Text = row.Cells[3].Value.ToString();
txtValue.Text = row.Cells[4].Value.ToString();
txtDeleteUpdate.Text = row.Cells[0].Value.ToString();
}
private void btnDelete_Click(object sender, EventArgs e)
{
if (txtDeleteUpdate.Text == "")
{
MessageBox.Show("Select Product to Delete");
}
else
{
foreach (DataGridViewRow row in dataGridView1.SelectedRows)
{
if (!row.IsNewRow) dataGridView1.Rows.Remove(row);
}
}
}
}
}

please help. thanks