private bool PriceIsValid()
{
try
{
double.Parse(ProductPriceTextBox.Text);
return(true);
}
catch (Exception)
{
MessageBox.Show("Price must be a valid decimal number.");
ProductPriceTextBox.Focus();
return(false);
}
}
// ====================== END OF SEARCH FUNCTIONALITY METHODS =========================
/*
* ====================== START OF INVENTORY MANAGEMENT METHODS =========================
* 1.AddProductButton_Click
* 2.CategoryButton_Click
* 3.ModifyButton_Click
*/
/*
* Event Handler for Adding New Product to Inventory
*/
private void AddProductButton_Click(object sender, EventArgs e)
{
Product Prod = new Product();
bool DuplicateProduct = false;
StreamWriter FileWriter;
FileWriter = File.AppendText(PRODUCTDATABASEFILENAME);
if (ProductNameTextBox.Text == "")
{
MessageBox.Show("Please enter New Product Name");
ProductNameTextBox.Focus();
ProductNameTextBox.SelectAll();
}
else
{
if (ProductCategoryListBox.SelectedIndex == -1)
{
MessageBox.Show("Please select Product Category from the list");
ProductCategoryListBox.Focus();
}
else
{
if (ProductPriceTextBox.Text == "")
{
MessageBox.Show("Please enter Product Price");
ProductPriceTextBox.Focus();
ProductPriceTextBox.SelectAll();
}
else
{
try
{
decimal.TryParse(ProductPriceTextBox.Text, out decimal ProductPrice);
if (ProductPrice <= 0)
{
MessageBox.Show("Product Price should be greater than Zero");
ProductPriceTextBox.Focus();
ProductPriceTextBox.SelectAll();
}
else
{
if (ProductQuantityTextBox.Text == "")
{
MessageBox.Show("Please enter Product Quantity");
ProductQuantityTextBox.Focus();
ProductQuantityTextBox.SelectAll();
}
else
{
try
{
int.TryParse(ProductQuantityTextBox.Text, out int ProductQuantity);
if (ProductQuantity <= 0)
{
MessageBox.Show("Product Quantity should be greater than Zero");
ProductQuantityTextBox.Focus();
ProductQuantityTextBox.SelectAll();
}
else
{
foreach (Product p in ProductList)
{
if (p.ProductCategory == ProductCategoryListBox.SelectedItem.ToString() &&
p.ProductName == ProductNameTextBox.Text)
{
MessageBox.Show("Same Product Already Exist in the same Category");
ProductNameTextBox.Focus();
ProductNameTextBox.SelectAll();
DuplicateProduct = true;
break;
}
}
if (DuplicateProduct == false)
{
Random RandomNumberGenerator = new Random();
int ProductNumber = RandomNumberGenerator.Next(1, 999999);
string CheckProductID = ProductCategoryListBox.SelectedItem.ToString().Substring(0, 4) + ProductNumber.ToString("D6");
while (ExistProductID_Check(CheckProductID))
{
ProductNumber = RandomNumberGenerator.Next(1, 999999);
CheckProductID = ProductCategoryListBox.SelectedItem.ToString().Substring(0, 4) + ProductNumber.ToString("D6");
}
Prod.ProductID = ProductCategoryListBox.SelectedItem.ToString().Substring(0, 4) + ProductNumber.ToString("D6");
FileWriter.WriteLine(Prod.ProductID);
Prod.ProductCategory = ProductCategoryListBox.SelectedItem.ToString();
FileWriter.WriteLine(Prod.ProductCategory);
Prod.ProductName = ProductNameTextBox.Text;
FileWriter.WriteLine(Prod.ProductName);
Prod.ProductPrice = decimal.Parse(ProductPriceTextBox.Text);
FileWriter.WriteLine(Prod.ProductPrice);
Prod.ProductQuantity = int.Parse(ProductQuantityTextBox.Text);
FileWriter.WriteLine(Prod.ProductQuantity);
ProductList.Add(Prod);
FileWriter.Close();
MessageBox.Show("Product '" + Prod.ProductName + "' Added Successfully to the Category '" + Prod.ProductCategory + "'");
ProductCategoryListBox.SelectedIndex = -1;
ProductNameTextBox.Text = ProductPriceTextBox.Text = ProductQuantityTextBox.Text = CheckProductID = "";
}
}
}
catch
{
}
}
}
}
catch
{
}
}
}
}
}