Question About Where To Position Try And Catch statements

I've used try and catch statements as an easy way to keep my code running without things crashing (I would wrap everything in a big try). Recently, I've wanted to start using try and catch statements more correctly. Here as an example I have questions about:

public class Ninja{
    Ninja(){
    }

    public void ThrowShirikin(int numberOfShirikins){
        try{
            if(numberOfShirikins == 0){
                throw new System.ArgumentException("Invalid number of shirikins");
            }

            //Throw shirikin
        }
        catch(ArgumentException e){
            MessageBox.Show(e.Message);
        }
    }
}

In the above Ninja class, the entire contents of my ThrowShirikin method is contained in a try loop. Since there is only one opportunity for an input error (in this case, when numberOfShirikins == 0), shouldn't only the lines of code that check for this be contained in the try loop? See below:

public class Ninja{
    Ninja(){
    }

    public void ThrowShirikin(int numberOfShirikins){
        bool errorsExist = false;
        try{
            if(numberOfShirikins == 0){
                errorsExist = true;
                throw new System.ArgumentException("Invalid number of shirikins");
            }
        }
        catch(ArgumentException e){
            MessageBox.Show(e.Message);
        }

        if(!errorsExist){
            //Throw shirikin
        }
    }
}

^But what I have here seems a bit clunky. Any suggestions and input on how I'm understanding the use of try catch statements? Thanks!

Edit:

Or I could do something like this so the //Throw shirikin code never executes if there is an invalid value for numberOfShirikins?:

public class Ninja{
    Ninja(){
    }

    public void ThrowShirikin(int numberOfShirikins){
        try{
            if(numberOfShirikins == 0){
                throw new System.ArgumentException("Inval