vb.net writer to excel function working on one pc but not on another - vb.net

Question

I have a vb.net function which uses oledb to create a spreadsheet, then treat it like a database, creating tables and inserting values. The function takes in a filename and a dataset, and returns the filename if it worked. The function works beautifully on my dev machine, but not other PCs. Below is my function, is there anything wrong with the code? Any suggestions?
EDIT: There are no errors being thrown, the resulting file doesn't contain any data.
Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Drawing
Imports System.IO
Imports System.Net.Mail
Imports System.Text
Imports System.Web
Imports Microsoft.Office.Interop
....
Public Shared Function writeToExcelFile(ByVal template As String, ByVal filename As String, ByVal data As DataSet) As String
If File.Exists(filename) Then
File.Delete(filename)
End If
If template <> String.Empty AndAlso filename <> String.Empty Then
File.Copy(template, filename)
End If
Dim connString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filename + ";Extended Properties=""Excel 8.0;HDR=Yes;"""
Dim conn As New OleDbConnection(connString)
Try
conn.Open()
Dim cmd As New OleDbCommand()
For Each table As DataTable In data.Tables
Dim tableName As String = table.TableName.Replace(" ", "")
Dim tableCreate As String = "CREATE TABLE [" + tableName + "] ("
Dim sql As String = "INSERT INTO [" + tableName + "$]("
Dim colName As String = String.Empty
For Each col As DataColumn In table.Columns
colName = col.ColumnName.Replace("#", "num")
If colName.Contains(" ") Then
sql += " [" + colName.Replace("'", "") + "],"
Else
sql += " " + colName.Replace("'", "") + ","
End If
tableCreate += " [" + colName + "] varchar(255),"
Next
If tableCreate.EndsWith(",") Then
tableCreate = tableCreate.TrimEnd(New [Char]() {","c})
End If
tableCreate += ") "
cmd = New OleDbCommand(tableCreate, conn)
cmd.ExecuteNonQuery()
If sql.EndsWith(",") Then
sql = sql.TrimEnd(New [Char]() {","c})
End If
sql += ") "
For Each row As DataRow In table.Rows
Dim values As String = " VALUES("
For Each col As DataColumn In table.Columns
Try
values += "'" + cleanString(row(col).ToString()).Substring(0, 250) + "...',"
Catch e As Exception
values += "'" + cleanString(row(col).ToString()) + "',"
End Try
Next
If values.EndsWith(",") Then
values = values.TrimEnd(New [Char]() {","c})
End If
values += ") "
cmd = New OleDbCommand(sql + values, conn)
cmd.ExecuteNonQuery()
Next
Next
conn.Close()
Return filename
Catch e As Exception
Throw New Exception(e.Message)
Return String.Empty
End Try
End Function

Answer 1

Check your system's Regional Settings vs other machines' Regional Settings.
If they differ, try to match them.
Also, when working with Office Automation you should force the thread's culture to en-US.
Set this just before calling writeToExcelFile() (C# syntax):
System.Threading.Thread.CurrentThread.CultureInfo = new System.Globalization.CultureInfo("en-US");
After calling the method, restore the culture (if needed).

Answer 2

Problem is not with this code. Problem is with the dataset that's being passed in.