A method can be overloaded in C# in four different ways:

1. By changing the number of parameters: A method can be overloaded by changing the number of parameters that it takes. For example, a method called print() could be overloaded to take one parameter, two parameters, or three parameters.
2. By changing the data types of the parameters: A method can also be overloaded by changing the data types of the parameters that it takes. For example, a method called add() could be overloaded to take two int parameters, two double parameters, or one int parameter and one double parameter.
3. By changing the order of the parameters: A method can also be overloaded by changing the order of the parameters that it takes. For example, a method called multiply() could be overloaded to take two int parameters in either order.
4. By using optional parameters: A method can also be overloaded by using optional parameters. Optional parameters are parameters that can be omitted when the method is called. For example, a method called format() could be overloaded to take one or two parameters. If only one parameter is passed, the second parameter is assumed to be the default value.

It is important to note that a method can only be overloaded if the methods have different signatures. The signature of a method is the combination of the method name, the number of parameters, the data types of the parameters, and the order of the parameters.

For example, the following two methods are overloaded because they have different signatures:

C#

public void print(int x) {
}

public void print(string x) {
}

However, the following two methods are not overloaded because they have the same signature:

C#

public void print(int x) {
}

public void print(int y) {
}

In this case, the compiler will not be able to distinguish between the two methods, so it will generate an error.