Try- catch and finally block in C#

C# me try k sath agar catch block nhi h to finally block ka hona jaruri h. 

C# me ek try block ke sath minimum ek catch block ya finally block hona chahiye.

Explanation:

1. Agar try block me koi exception aati hai, toh program catch block ko execute karta hai.
2. Agar exception handle karna zaroori nahi hai lekin clean-up karna zaroori hai, toh aap finally block ka use kar sakte hain.
3. catch aur finally block dono optional hain, lekin unme se ek hona zaroori hai.

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Example: Minimum ek catch block

try
{
    int x = 10 / 0; // Divide by zero exception
}
catch (Exception ex)
{
    Console.WriteLine("An exception occurred: " + ex.Message);
}

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Example: Only finally block (No catch block)

Agar aapko exception handle nahi karni lekin resources ko clean-up karna hai:

try
{
    Console.WriteLine("Try block executed.");
}
finally
{
    Console.WriteLine("Finally block executed.");
}

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Notes:

1. Ek se zyada catch block: Ek try ke sath multiple catch blocks ho sakte hain agar aap specific exceptions ko handle karna chahte hain.

try
{
    int[] arr = new int[5];
    Console.WriteLine(arr[10]); // IndexOutOfRangeException
}
catch (IndexOutOfRangeException ex)
{
    Console.WriteLine("Index out of range: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("General exception: " + ex.Message);
}

2. Agar catch aur finally dono ko hata diya jaye, toh compiler error dega.