private void btnFirst_Click(object sender, EventArgs e)
{
Order1 order = bl.GetFirstOrder();
PopulateTextBoxes(order);
dataGridView1.DataSource = bl.CreateDataTable(Convert.ToInt32(orderIDTextBox.Text));
}
//method to update db with new ship date
private void btnUpdate_Click(object sender, EventArgs e)
{
//checks if the ship date field is empty
if (bl.ValidateIsNull(txtShipDate.Text))
{
//if ship date field is empty, constructs an order object with a null ship date
Order1 updatedOrder = CreateOrderFromForm(bl.ConvertDateToNull());
//attempts to update database with new order object
if (bl.UpdateShippedDate(updatedOrder))
{
//if update is successful
MessageBox.Show("Order updated successfully with null date");
}
else
{
//if update is unsuccessful, this indicated a concurrency error has occurred. data refreshes with changed info and user is informed
bl.RefreshDataBase();
Order1 newOrder = bl.GetOrderByID(Convert.ToInt32(orderIDTextBox.Text));
PopulateTextBoxes(newOrder);
MessageBox.Show("Concurrency Error: Data has been altered or deleted");
}
}
//if the ship date field is not empty, checks if it is a valid datetime
else if (bl.ValidateDateTimeEntryFormat(txtShipDate.Text))
{
//if the date is entered in a valid format, it is checked to make sure it is in the valid range (after order date but before required date)
if (bl.ValidateDateTimeEntryDate(Convert.ToDateTime(txtShipDate.Text), GetOrderDateTime(), GetRequiredDateTime()))
{
//if date is in acceptable range, order object is built from form and an attempt is made to update the database with it
Order1 updatedOrder = CreateOrderFromForm(Convert.ToDateTime(txtShipDate.Text));
if (bl.UpdateShippedDate(updatedOrder))
{
MessageBox.Show("Order updated successfully with valid date");
}
//if update is unsuccessful, this indicated a concurrency error has occurred. data refreshes with changed info and user is informed
else
{
bl.RefreshDataBase();
Order1 newOrder = bl.GetOrderByID(Convert.ToInt32(orderIDTextBox.Text));
PopulateTextBoxes(newOrder);
MessageBox.Show("Concurrency Error: Data has been altered or deleted");
}
}
//date failed range validation
else
{
txtShipDate.Text = "";
txtShipDate.Focus();
MessageBox.Show("Please enter a valid date that is after the order date and before the required date");
}
}
//date failed format validation
else
{
txtShipDate.Text = "";
txtShipDate.Focus();
MessageBox.Show("Please enter a valid date in the form yyyy-mm-dd");
}
}
private void btnPrev_Click(object sender, EventArgs e)
{
int orderId = Convert.ToInt32(orderIDTextBox.Text);
Order1 order = bl.GetPreviousOrder(orderId);
PopulateTextBoxes(order);
dataGridView1.DataSource = bl.CreateDataTable(Convert.ToInt32(orderIDTextBox.Text));
}
//used to check if a searched order exists (is not null)
public bool ValidateOrderExists(Order1 order)
{
if (order != null)
{
return(true);
}
else
{
return(false);
}
}
//method to populate form with data from order object
public void PopulateTextBoxes(Order1 order)
{
orderIDTextBox.Text = Convert.ToString(order.OrderID);
string orderDate = $"{order.OrderDate:yyyy-MM-dd}";
customerIDTextBox.Text = Convert.ToString(order.CustomerID);
string reqDate = $"{order.RequiredDate:yyyy-MM-dd}";
string shipDate = $"{order.ShippedDate:yyyy-MM-dd}";
txtOrderDate.Text = orderDate;
txtReqDate.Text = reqDate;
txtShipDate.Text = shipDate;
}
//method to use data in form to construct an order object (allows nulls in shipdate)
public Order1 CreateOrderFromForm(DateTime?shipDate)
{
int orderID = Convert.ToInt32(orderIDTextBox.Text);
DateTime orderDate = Convert.ToDateTime(txtOrderDate.Text);
string customerID = customerIDTextBox.Text;
DateTime reqDate = Convert.ToDateTime(txtReqDate.Text);
var newOrder = new Order1
{
OrderID = orderID,
OrderDate = orderDate,
CustomerID = customerID,
RequiredDate = reqDate,
ShippedDate = shipDate
};
return(newOrder);
}
//method to update db with new data
public bool UpdateShippedDate(Order1 oldOrder)
{
//creates a new order object based on updated order orderId
var newOrder = db.Order1s.First(o => o.OrderID == oldOrder.OrderID);
//changes ship date in order to new value
newOrder.ShippedDate = oldOrder.ShippedDate;
try
{
//attempts to update database with new information
db.SubmitChanges();
return(true);
}
//if a concurrency error exists, a changeconflictexception will be thrown and the method will return false, telling the form that a concurrency error has occured
catch (System.Data.Linq.ChangeConflictException)
{
return(false);
}
}
//use order id to search db for matching order
public Order1 GetOrderByID(int id)
{
Order1 order = db.Order1s.FirstOrDefault(x => x.OrderID == id);
return(order);
}
