Methods

In this section we'll review:

• What are methods - a better way to organize code
• We'll extract the order validate logic, to the ValidateOrderDateMethod

protected override void OnSavingRow()
{
-   if (u.Year( Orders.OrderDate) < 1990 || Orders.OrderDate.Year>2020)
-   {
-       Message.ShowError("Invalid Year");
-   }
    ValidateOrderDate();
}

void ValidateOrderDate()
{
    if (u.Year(Orders.OrderDate) < 1990 || Orders.OrderDate.Year > 2020)
    {
        Message.ShowError("Invalid Year");
    }
} 

• Demo how to use the "ExtractMethod" automatic refactoring from Visual Studio

• Method with return value
• Introducing Regions
• Using CSharp 6 features to write shorter methods
• Expressions are migrated to methods

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