Guidelines for using control structures(if/else if/Switch )

Important Note : program readability is most important after working software.

If statements :

• Write nominal path through the code first ;then write the unusual cases last
• Put the normal case after the if rather than the else
• Try to consider the else clause 

If else if Statements :

• Simplify the complicated condition checking with a function call
• Keep the most common case first
• Try to use switch/case statement instead of if else statements

Switch/Case statements :

• Order cases alphabetically or numerically
• Put the normal case first
• Put the most frequently executed case first and the least executed cases last
• Use default case for detecting legitimate defaults or errors

Guidelines for using and naming variable in C#

Important Note : program readability is most important after working software.

Guidelines in using variables :

• Declare and define variable close to the where it is being used for the first time
• Use const wherever possible
• Keep variable scope as short as possible
• Try not to use global variables
• Use variable for one purpose only
• Avoid variable with hidden messages

Guidelines in naming variables :

• Code is read far more times than it is written. Favor read-time convenience over write-time convenience 
• You should not give variable name like how you name your dog
• Goodness/ Badness are determined by variable`s name
• A good variable should be readable ,memorable and appreciate
• Avoid the variables names like temp, x, y (who knows what does that mean ??)
• Try to give names to problem domain
• Come up with a standard naming conventions in cases like revenveTotal, totalRevenve.. etc.
• For naming looping indexes, Try to come up with a more descriptive names than I, j, and k
• Come with a better name than just using flag for naming status variables
• Give temporary variables more descriptive names
• Do not use negative variable names like “NotFound”, Use positive names like “Found”
• Avoid misspelled word in variable name like cnt(count) ,msg(Message)
• Do not differentiate variable names solely by capitalization

The C# dynamic Keyword in C# 4.0 and upwards

dynamic keyword a specialized form of System.Object, in that any value can be assigned to a  dynamic data type.
• a data point declared with the dynamic keyword can be assigned any initial value at all, and can be reassigned to any new (and possibly unrelated) value during its lifetime.
• IntelliSense is not possible with dynamic data.
• It is not mandatorily to use dynamic keyword  (With Dynamic keyword, The intention is to reduce verbose, that’s it)
• It is not statically typed it means that validity of dynamic statement is checked at runtime not at compile time
• Invalid dynamic statement is validated at run time using RuntimeBinderException  available in Microsoft.CSharp.dll
• Cannot make use of lambda /anonymous methods
• Cannot understand any extension method
• It is used in cases where your .Net application interacts with COM libraries (like Microsoft Office products) or VSTO application
• Can be used as parameters, return value or a member of class/structure

Extract Method Refactoring in C#

When to use this:

1. Length of the method is not an issue
2. To improve clarity of the code
3. The name of the new method will reveal the intention of the code in a better way. If you can't come up with a more meaningful name, don't extract the code

       Example : Suppose we have method to use this extract method. by selecting console.WriteLine statement as below

        public void Add(int x, int y)

        {

            int z = x + y;

            Console.WriteLine(z);

        }

We can also right-click the selected code, point to Refactor, and then click Extract Method (Short cut  is CTRL+R, M)  to display the Extract Method dialog box.

The final extracted method is as follows