C# Custom Exception

Create custom exceptions which are then added to existing try catch blocks (above the general exception as they are processed top down.)

Custom Exception

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using System;

namespace Business.Exceptions
{
    public class CoordinateNotFoundException : Exception
    {
        public CoordinateNotFoundException()
        {
        }

        public CoordinateNotFoundException(string message)
            : base(message)
        {
        }

        public CoordinateNotFoundException(string message, Exception inner)
            : base(message, inner)
        {
        }
    }
}

Consumption

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private void ThrowCoordinateNotFoundException(string messagePart) 
{
    throw new CoordinateNotFoundException($"CoordinatePartsModel {messagePart} is required.");
}

Handling Exceptions

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try
{
    // do the bad thing
}
catch (CoordinateNotFoundException exc)
{
    // handle CoordinateNotFoundException
}
catch (Exception ex)
{
    // Handle all other general exceptions
}

References