What is the best way to write multiple if tags that compare two variables

I am a beginner in C# coding, and I was trying to compare two int variables (C#).

void CompareNumber() {
    int oneNumber;
    int secondNumber;

    if (oneNumber > secondNumber)
        {
        DoSomething();
        }

    else if (oneNumber < secondNumber)
        {
        DoSomething();
        }

    else if (oneNumber == secondNumber)
        {
        DoSomething();
        }
}

While this does work, it looks kinda messy, especially because I compare variables in this manner many times. Is there a more concise way of doing this, making it look neater? (Except for omitting the curly brackets)