What is out parameter in c#? How to use out parameter in c#?

 In C#, an out parameter is used to pass a value from a method back to the caller, similar to a ref parameter. However, unlike a ref parameter, an out parameter does not require the value to be initialized before it is passed to the method.

The out keyword is used to specify an out parameter in a method signature. Here's an example:

csharp
public void Calculate(int input, out int output)
{
    // Perform some calculations
    output = input * 2;
}

In this example, we define a method called Calculate that takes an integer input parameter and an out integer output parameter. Inside the method, we perform some calculations and set the value of output to the result. When the method is called, the output parameter must be declared and passed to the method as an argument. After the method has completed execution, the value of output will contain the calculated result.

Here's an example of how to call the Calculate method:

int input = 5;
int output;
Calculate(input, out output);
Console.WriteLine(output); // Output: 10

In this example, we declare an integer input variable and pass it to the Calculate method along with the output parameter declared as an out parameter. After the method has completed execution, the value of output will contain the calculated result, which we can then print to the console.