Truncation Error

All,

I am having a strange problem that I have been looking at for a day now, and my head is straing to hurt as I have banged my head on the desk so many times. I have written an extensible set of classes that allow me to build SSIS packages dynamically via a web front end. I am finding this code is working OK, but I have this silly bug.

The code is trying to generate an SSIS package that does somethign very simple, and transfer data from a 10 coumn table with a mix of data types, move through another component that adds a couple of extra columns on basic on some variables, then map it onto a OLD DB destination. This code works fine, until I start using strings of various lengths.

When the package runs, it fails validation with errors saying that truncation may occur as I am trying to put a 100 character string, into a 50 character string. The error is logical as you wouldn';t want to do that, but this is not what I am doing. I am actually transfering data from a 50 character string into a 100 character string. When I try it with a table where the strings are the same length at both ends, or no strings are involved, everything works fine, and the data goes from the source to the destination.

I must be setting something slightly wrong which only triggers this problem when the sizes don't match, but the data flow direction is fine, and the data types match. I have included the code from the piece of code that 'writes' the output part of the package. If anyone has any idea what might be going wrong, I would be forever in their debt!




Code Block
private void ConfigureInputColumns(Package package, MainPipe pipe, IDTSOutput90 SourceColumnCollection)
{
_InstanceOfDestination.AcquireConnections(null);
_InstanceOfDestination.ReinitializeMetaData();
IDTSPath90 path = pipe.PathCollection.New();
path.AttachPathAndPropagateNotifications(SourceColumnCollection,_Destination.InputCollection[0]);

IDTSInput90 input = _Destination.InputCollection[0];
IDTSVirtualInput90 vInput = input.GetVirtualInput();
int iIndex = 0;
foreach (IDTSVirtualInputColumn90 vColumn in vInput.VirtualInputColumnCollection)
{
// Call the SetUsageType method of the destination
// to add each available virtual input column as an input column.
_InstanceOfDestination.SetUsageType(input.ID, vInput, vColumn.LineageID, DTSUsageType.UT_READWRITE);
}
IDTSExternalMetadataColumn90 exInputColumn;
foreach (IDTSInputColumn90 inColumn in _Destination.InputCollection[0].InputColumnCollection)
{
// create the MAP
// What we need to do here, is say what source column, goes to what destination column.
// we read by index, and we need to map the specifics, we could control just 3 of 20 columns
// to whatever column we wanted in the destination......
// We know the name of the inColumn - It is called inColumn.Name, we need to find the column
// we want to map with by finding its name.
if (inColumn.Name == "BatchID" || inColumn.Name == "ValidationStatus")
{
exInputColumn = _Destination.InputCollection[0].ExternalMetadataColumnCollection[inColumn.Name];
// map it
_InstanceOfDestination.MapInputColumn(_Destination.InputCollection[0].ID, inColumn.ID, exInputColumn.ID);
}
else if (Mapping.Map.ContainsKey(inColumn.Name))
{
exInputColumn = _Destination.InputCollection[0].ExternalMetadataColumnCollection[Mapping.Map[inColumn.Name]]; // inColumn.Name

// map it
_InstanceOfDestination.MapInputColumn(_Destination.InputCollection[0].ID, inColumn.ID, exInputColumn.ID);
}
}
_InstanceOfDestination.ReleaseConnections();
}