区分原始System.Exception和引发新的Exception / ApplicationException？

Question

I have already solved the question, and I posted.

For the method that mad the call, is it possible to differentiate between the original System.Exception (ie. throw ex; ) and a new Exception (ie. throw new Exception("Specific error", ex); ) or new ApplicationException ?

public void InsertNewCar()
{
    try
    {
        Car myCar = new Car();
        myCar.Insert();
    }
    catch (Exception ex)
    {
    if ( /* This ex is the New Exception */
        alert(somethingMissingMsg);
    }
    else /* This is the original exception */
    {
        alert(Something wrong generic error);
    }
}

public void Insert()
{
    try
    {
        SqlHelper.ExecuteNonQuery(ConnString, CommandType.Text, sqlInsert);
    }
    catch (SqlException ex)
    {
        if (ex.Number == 515)
        {
            throw new Exception("Missing something", ex);
            //throw new ApplicationException("Missing something", ex);
        }
        else
        {
            throw ex;
        }
    }
}

Thanks.

Answer 1

You can specify what kind of exception you want to catch (mind the ordering). Exceptions have an InnerException property that may contain additional information that caused the current exception.

try
{
    MethodThatBlowsUp();
}
catch (ApplicationException appex)
{
    //handle 
}
catch (Exception ex)
{
    //handle
}

Answer 2

Ended up using this:

public void InsertNewCar()
{
    try
    {
        Car myCar = new Car();
        myCar.Insert();
    }
    catch (Exception ex)
    {
    if (ex is ApplicationException)
        alert("Something missing Msg");
    else /* This is the original exception */
        alert("Something wrong generic error");
}

public void Insert()
{
    try
    {
        SqlHelper.ExecuteNonQuery(ConnString, CommandType.Text, sqlInsert);
    }
    catch (SqlException ex)
    {
        if (ex.Number == 515)
        {
            throw new ApplicationException("Missing something", ex);
        }
        else
        {
            throw ex;
        }
    }
}