Create a Python program that manages a personal expense tracker. The program should allow users to perform the following operations:

1. Add Expense: Users can add a new expense by providing details such as date, category (e.g., groceries, transportation, entertainment), and amount spent.
2. Delete Expense: Users can delete an expense from the tracker by specifying the expense ID or date.
3. Update Expense: Users can update the details (category or amount) of an existing expense.
4. View Monthly Summary: Display a summary of expenses for a specific month, including total spending and category-wise breakdown.
5. Export Data: Allow users to export their expense data to a CSV file for further analysis.

Requirements:

• Use classes and object-oriented programming to design the expense tracker.
• Implement error handling for cases such as invalid expense IDs or incorrect input.
• Store expense records in a list or dictionary within the program.

Sample Code Structure:

 class ExpenseTracker:
    def __init__(self):
        # Your code here

    def add_expense(self, date, category, amount):
        # Your code here

    def delete_expense(self, expense_id):
        # Your code here

    def update_expense(self, expense_id, category=None, amount=None):
        # Your code here

    def view_monthly_summary(self, month, year):
        # Your code here

    def export_to_csv(self, filename):
        # Your code here

# Example usage:
tracker = ExpenseTracker()
tracker.add_expense("2024-04-15", "Groceries", 100)
tracker.add_expense("2024-04-20", "Transportation", 50)
tracker.view_monthly_summary(4, 2024)
tracker.export_to_csv("expenses.csv")