//Event Handler for QuantityTextBox change
//If user directly enters value of quantity
private void QuantityTextBox_Leave(object sender, EventArgs e)
{
int Value = 0;
try
{
int CurrentValue = int.Parse(QuantityTextBox.Text);
//checking if input is less than zero
if (CurrentValue <= 0)
{
MessageBox.Show("Zero or Less quantity not Allowed. You can use delete button to remove the product from Cart");
QuantityTextBox.Undo();
QuantityTextBox.SelectAll();
QuantityTextBox.Focus();
}
//if input is greater than 0
else
{
for (int i = 0; i < MainForm.ProductList.Count; i++)
{
//finding the product
if (MainForm.ProductList[i].ProductCategory == this.ProdCat &&
MainForm.ProductList[i].ProductID == this.ProdID)
{
//checking the available stock quantity
if (CurrentValue <= MainForm.ProductList[i].ProductQuantity)
{
//Rechecking the previous quantity
QuantityTextBox.Undo();
if (QuantityTextBox.Text != CurrentValue.ToString())
{
Value = CurrentValue;
try
{
CurrentValue = CurrentValue - int.Parse(QuantityTextBox.Text);
QuantityTextBox.Text = Value.ToString();
}
catch
{
QuantityTextBox.Text = Value.ToString();
}
}
//Calculating Items and Totals using provided quantity
MainForm.TotalItems += CurrentValue;
MainForm.GrandTotal += (CurrentValue * this._ProductPrice);
MainForm frm = (MainForm)this.FindForm();
frm.TotalItemsLabel.Text = MainForm.TotalItems.ToString();
frm.GrandTotalLabel.Text = MainForm.GrandTotal.ToString();
ProductTotalPriceLabel.Text = (Value * this._ProductPrice).ToString();
break;
}
else
{
MessageBox.Show("Requested Quantities of " + this.ProdName + " are not available in inventory",
"Not Enough Items Available", MessageBoxButtons.OK, MessageBoxIcon.Error);
QuantityTextBox.Undo();
QuantityTextBox.Focus();
}
}
}
}
}
catch
{
MessageBox.Show("Only Numbers are allowed in quantity. Please enter valid quantity",
"Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Error);
QuantityTextBox.Focus();
QuantityTextBox.SelectAll();
QuantityTextBox.Undo();
}
}