Error Handling For SSIS Packages In .NET

Hi guys,
i'm running my SSIS package via a web application,





Microsoft.SqlServer.Dts.Runtime.Application app = new Microsoft.SqlServer.Dts.Runtime.Application();

Package pkg = app.LoadFromSqlServer("\send mail test", "localhost", null, null, null);

Variables vars = pkg.Variables;

vars["username"].Value = "C# user Name ";

vars["message"].Value = "C# body text";

DTSExecResult result = pkg.Execute();

//MessageBox.Show(result.ToString(), "result from dts"); --app mode

now sometimes the "result" variable return Failure, but i don't know what's wrong, when i run the package in debug mode (in VS) it works fine. DTSExecResult only returns "Success" or "Failure", is there a way to find out more information about the result. like why did the package fail?

the ssis package is built with event handlers but they don't get triggered. it's just when i execute from the web it just returns failed. i checked all the SQL connections as well, they are all fine, as they use SQL authentication, and connection strings are hardcoded as expressions.

any help?