In C#, a method can return a value using the return keyword. When a method returns a value, it must have a return type specified in its declaration. Here is an example of a method that returns an integer value:

public static int Add(int num1, int num2)
{
    int sum = num1 + num2;
    return sum;
}

In this example, we’ve declared a method called Add that takes two integer parameters, num1 and num2. The method calculates the sum of the two parameters and stores the result in a variable called sum. The method then returns the value of sum using the return keyword.

We can call this method from elsewhere in our code and use the returned value. Here’s an example:

int result = Add(5, 7);
Console.WriteLine(result); // Output: 12

In this example, we’re calling the Add method with the arguments 5 and 7. The method returns the sum of these two values, which is 12. We’re then assigning the returned value to a variable called result, and finally printing the value of result to the console.

Methods can return values of any data type, including integers, floating-point numbers, Booleans, characters, strings, and even complex objects. Here’s an example of a method that returns a string value:

public static string Greet(string name)
{
    return "Hello, " + name + "!";
}

In this example, we’ve declared a method called Greet that takes a string parameter called name. The method concatenates the name parameter with the string “Hello, " and the string “!”, and returns the resulting string.

We can call this method from elsewhere in our code and use the returned value. Here’s an example:

string message = Greet("John");
Console.WriteLine(message); // Output: "Hello, John!"

In this example, we’re calling the Greet method with the argument "John". The method returns the string “Hello, John!”, which is assigned to a variable called message. Finally, we print the value of message to the console.