C#

namespace Test
{
    class Test
    {
        [System.STAThreadAttribute]
        static void
        Main
        (
            string[] args
        )
        {
            try
            {
                PIEBALD.Types.Hierarchary<string> store = 
                new PIEBALD.Types.Hierarchary<string>
                (
                    typeof(int)
                ,
                    typeof(int)
                ,
                    typeof(string)
                ) ;

                store [ 1234 , 1 , "Property1" ] = "1234 1 1" ;
                store [ 1234 , 1 , "Property2" ] = "1234 1 2" ;

                store [ 1234 , 2 , "Property1" ] = "1234 2 1" ;
                store [ 1234 , 2 , "Property2" ] = "1234 2 2" ;

                store [ 1237 , 1 , "Property1" ] = "1237 1 1" ;
                store [ 1237 , 1 , "Property2" ] = "1237 1 2" ;

                System.Console.WriteLine ( "ProductId (key)   InventId (key)   Property1 (value)    Property2 (value)" ) ;

                foreach ( int k1 in store.Keys<int>() )
                {
                    foreach ( int k2 in store.Keys<int> ( k1 ) )
                    {
                        System.Console.WriteLine
                        (
                            "{0,-17} {1,-16} {2,-20} {3,-20}"
                        ,
                            k1
                        ,
                            k2
                        ,
                            store [ k1 , k2 , "Property1" ]
                        ,
                            store [ k1 , k2 , "Property2" ]
                        ) ;
                    }
                }
            }
            catch ( System.Exception err )
            {
                System.Console.WriteLine ( err.Message ) ;
            }

            return ;
        }
    }
}

if(ex is ArgumentNullException)
{
MessageBox.Show("Thau shall not nullify");
}

public string GetErrorCode(Exception ex)<br />
{<br />
     if (ex is COMException)<br />
     {<br />
          return ex.ErrorCode.ToString();<br />
     }<br />
     else<br />
     {<br />
          return "";<br />
     }<br />
}

if (ex is COMException)
{
    COMException comEx = ex as COMException
    return comEx.ErrorCode.ToString();
}

COMException comEx = ex as COMException
if(comEx !=null)
{
   return comEx.ErrorCode.ToString();
}

if (ex is COMException)
{    
    return ((COMException)ex).ErrorCode.ToString();
}

COMException COMex = new COMException();<br />
<br />
COMex = (COMException)ex;

JoeRip wrote:

I had to create a new COMException

//wont work<br />
ex = (COMException)ex;