Excel Connection Manager Fails When Package Called Programatically

I've put together a SSIS package that, once a user uploads an Excel spreadsheet from a webpage, grabs it, does a mess of calculations and spits it out into a datareader (this last part is tricky, but I haven't even gotten to this point yet). In BIDS, the package works fine. Run using the 32-bit version of dtexec, it runs fine. But when I try to call it from the page, I keep getting an error. The errors look familiar enough that I'm thinking it's due to the package trying to run 64-bit, and that not playing nicely with Excel. If that's true, is there an easy way to force the 32-but version to be used? I've already set the project properties to Run64BitRuntime = false, which I'd hoped would help. but no luck.

Here's the code I'm using:




Code Snippet
string pkg = @"pathpackage.dtsx";
Application app = new Application();
Package p = app.LoadPackage(p, null);
Variable varFileName = p.Variables["strExcelFileName"];
varFileName.Vaue = strFileName;
Variable varFilePath = p.Variables["strExcelFilePath"];
varFilePath.Value = strFilePath;

DTSExecResult dte = p.Execute();

Error handling

p.Dispose();




And it kicks out the following:

-1071636471
TestReports_UploadTestReport
Connection manager "Excel Connection Manager"
Microsoft.SqlServer.Dts.Runtime.DtsError0{8BDFE898-E9D8-4D23-9739-DA807BCDC2AC}
SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80040154. An OLE DB record is available. Source: "Microsoft OLE DB Service Components" Hresult: 0x80040154 Description: "Class not registered".
-1071611876
DFT - Upload spreadsheet to dataset
Excel Source [1]
Microsoft.SqlServer.Dts.Runtime.DtsError0dtsmsg.rll{8BDFE893-E9D8-4D23-9739-DA807BCDC2AC}
SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "Excel Connection Manager" failed with error code 0xC0202009. There may be error messages posted before this with more information on why the AcquireConnection method call failed.
-1073450985
DFT - Upload spreadsheet to dataset
DTS.Pipeline
Microsoft.SqlServer.Dts.Runtime.DtsError0dtsmsg.rll{8BDFE893-E9D8-4D23-9739-DA807BCDC2AC}
component "Excel Source" (1) failed validation and returned error code 0xC020801C.
-1073450996
DFT - Upload spreadsheet to dataset
DTS.Pipeline
Microsoft.SqlServer.Dts.Runtime.DtsError0dtsmsg.rll{8BDFE893-E9D8-4D23-9739-DA807BCDC2AC}
One or more component failed validation.
-1073594105
DFT - Upload spreadsheet to dataset