Array
(
    [dirname] => .
    [basename] => frmAddModify.cs
    [extension] => cs
    [filename] => frmAddModify
)
1. file=./frmAddModify.cs<br>
2. file=.//frmAddModify.cs<br>
3. file=frmAddModify.cs<br>
<?php // Save this file as: ./frmAddModify.cs ?>
using ProductMaintenance.Models.DataLayer;

namespace ProductMaintenance;

public partial class frmAddModify : Form
{
    public frmAddModify()
    {
        InitializeComponent();
    }

    // add public property for a Product entity 
    public Product Product { get; set; } = null!;

    private void frmAddModify_Load(object sender, EventArgs e)
    {
        if (Product == null)
        {
            Text = "Add Product";
            txtProductCode.ReadOnly = false;  // allow entry of new product code

            // initialize form level Product property
            Product = new();
        }
        else
        {
            Text = "Modify Product";
            txtProductCode.ReadOnly = true;   // can't change existing product code
            DisplayProduct();
        }
    }

    private void DisplayProduct()
    {
        // display the product information
        txtProductCode.Text = Product.ProductCode;
        txtDescription.Text = Product.Description;
        txtUnitPrice.Text = Product.UnitPrice.ToString();

        txtDescription.Focus();
    }

    private void btnAccept_Click(object sender, EventArgs e)
    {
        if (IsValidData())
        {
            LoadProductData();
            DialogResult = DialogResult.OK;
        }
    }

    private bool IsValidData()
    {
        bool success = true;
        string errorMessage = "";

        errorMessage += Validator.IsPresent(txtProductCode.Text, "Product Code");
        errorMessage += Validator.IsPresent(txtDescription.Text, "Description");
        errorMessage += Validator.IsPresent(txtUnitPrice.Text, "Unit Price");
        errorMessage += Validator.IsDecimal(txtUnitPrice.Text, "Unit Price");

        if (!string.IsNullOrEmpty(errorMessage))
        {
            success = false;
            MessageBox.Show(errorMessage, "Entry Error");
        }
        return success;
    }

    private void LoadProductData()
    {
        // load user entries in Product property 
        Product.ProductCode = txtProductCode.Text;
        Product.Description = txtDescription.Text;
        Product.UnitPrice = Convert.ToDecimal(txtUnitPrice.Text);
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {
        this.Close();
    }
}