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Properties - Programming

Q1:

Which of the following is the correct way to implement a read only property Length in a Sample class?

A 
class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
    } 
}

B 
class Sample
{
    public int Length
    {
        get
        {
            return Length;
        } 
    } 
}

C 
class Sample
{
    public int Length
    {
        get
        {
            return Length;
        } 
    } 
}

D 
class Sample
{
    int len;
    public int Length
    {
        Readonly get
        {
            return len;
        } 
    } 
}

ANS:A - 

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
    } 
}

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