How do I update a BizTalk from VisualStudio 2005

Hello!

I have a csv flat file as input and a generated flat file schema to this file.
I have also a sample xml file as output and from this file generated a schema.
I have also created a map between the input schema and the output schema.
I have also custom pipeline that is using flat file disassembler
I use also strong names so a keyfile is created(sn -k keyfile.snk)

I deploy the project so when I enter the BizTalk server Console Administration I can find
2 schema one for input and one for output one mapping file and one receive pipeline and this
is correct according to my configuration.

Everything is working so when a copy a csv flat file to the In folder a xml file is created in the Out folder with all the records from the csv file so everthing works good.

Now to my question.
If I for example have to change the output schema for a field year that is
of type string with default value of NoYear but need to be changed to int with a default value of 2009 how do I do that.
My first attempt was to change in the visual studio and build + deploy but this didn’t cause any effect of the output xml file.
My second attempt was to remove the application in BizTalk and then change in visual studio + build + deploy. This for some reason didn’t give no output xml file and in the event viewer I could read the following error.
Object reference not set to an instance of an object.
My third attempt was to remove the Biztalk application + remove the visual studio solution and then
create everytning from beginning and then everytning worked.

I just want to have a comment about this and what should be enough when I want to change a output schema. I assume that Biztalk doesn’t require to do what I did in my third attempt.

//Tony