private void btnUpdate_Click(object sender, EventArgs e)
        {
            try
            {
                DialogResult dialogResult = MessageBox.Show("DO YOU WANT UPDATE STOCK?", "STOCK UPDATION", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
                if (dialogResult == DialogResult.Yes)
                {
                    if (tbEditAddStock.Value == 0 || tbEditFinalStock.Text == "" || tbEditItemName.Text == "" || tbEditItemCategory.Text == "" || tbEditItemStock.Text == "" || tbEditItemDescription.Text == "" || tbEditItemNumber.Text == "")
                    {
                        MessageBox.Show("FORM FIELD(S) CAN NOT BE LEFT EMPTY. PLEASE COMPLETE THE FORM TO EDIT DATA", "DATA UPDATE ERROR", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        tbEditAddStock.Focus();
                    }
                    else
                    {
                        string InventoryNumber = tbEditItemNumber.Text;
                        string InventoryName = tbEditItemName.Text;
                        string InventoryDescription = tbEditItemDescription.Text;
                        string InventoryCategory = tbEditItemCategory.Text;
                        string ItemStock = tbEditFinalStock.Text;

                        Admin Update = new Admin();
                        Update.UpdateStock(InventoryNumber, InventoryName, InventoryDescription, InventoryCategory, ItemStock);

                        MessageBox.Show("STOCK UPDATED", "ITEM STOCK UPDATED", MessageBoxButtons.OK, MessageBoxIcon.Information);

                        tbEditAddStock.Value = 0;

                        tbEditItemNumber.Clear();
                        tbEditItemName.Clear();
                        tbEditItemDescription.Clear();
                        tbEditItemCategory.Clear();
                        tbEditFinalStock.Clear();
                        tbEditItemStock.Clear();

                        RefreshDG();
                    }
                }
            }
            catch (SqlException)
            {
                MessageBox.Show("MICROSOFT SQL SERVER DATABASE ERROR!", "ERROR OCCURS", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (InvalidOperationException)
            {
                MessageBox.Show("INVALID OPERATION!", "ERROR OCCURS", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "ERROR OCCURS", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }