How to return a value using constructor in c#?

Question

I follow a convention that I won't use any print statements in classes, but I have done a parameter validation in a constructor. Please tell me how to return that validation which I've done in the constructor to the Main function.

Answer 1

The constructor does return a value - the type being constructed...

A constructor is not supposed to return any other type of value.

When you validate in a constructor, you should throw exceptions if the passed in values are invalid.

public class MyType
{
    public MyType(int toValidate)
    {
      if (toValidate < 0)
      {
        throw new ArgumentException("toValidate should be positive!");
      }
    }
}

Answer 2

Constructors do not have a return type, but you can pass values by reference using the ref keyword. It would be better to throw an exception from the constructor to indicate a validation failure.

public class YourClass
{
    public YourClass(ref string msg)
    {
         msg = "your message";
    }

}    

public void CallingMethod()
{
    string msg = string.Empty;
    YourClass c = new YourClass(ref msg);       
}