failed to read the excel to sql database - vb.net

Question

I want to upload an Excel file and write data to sql server 2008.
The Excel file has 7 sheets and it writes in 7 tables.
Example : (sheetn -> temp_sheetn)
The code is working well but the last sheet is not writing in the last table.
The code is like this:
Partial Class app_UploadData
Inherits System.Web.UI.Page
Dim apps As New MyApps
Dim GlobReg As Integer = 0
Dim GlobOTC As Integer = 0
Private dt As DataTable = Nothing
Public Function xlsInsert(ByVal pth As String) As System.Data.DataTable
Dim strcon As String = String.Empty
If Path.GetExtension(pth).ToLower().Equals(".xls") OrElse Path.GetExtension(pth).ToLower().Equals(".xlsx") Then
strcon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & pth & ";Extended Properties=""Excel 8.0;HDR=YES;"""
Else
strcon = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & pth & ";Extended Properties=""Excel 12.0;HDR=YES;"""
End If
Dim strselect As String = "Select * from [Sheet1$]"
Dim exDT As New DataTable()
Using excelCon As New OleDbConnection(strcon)
Try
excelCon.Open()
Using exDA As New OleDbDataAdapter(strselect, excelCon)
exDA.Fill(exDT)
End Using
Catch oledb As OleDbException
Throw New Exception(oledb.Message.ToString())
Finally
excelCon.Close()
End Try
For i As Integer = 0 To exDT.Rows.Count - 1
' Check if first column is empty
' If empty then delete such record
If exDT.Rows(i)("CardNo").ToString() = String.Empty Then
exDT.Rows(i).Delete()
End If
Next
exDT.AcceptChanges()
' refresh rows changes
If exDT.Rows.Count = 0 Then
Throw New Exception("File uploaded has no record found.")
End If
Return exDT
End Using
End Function
Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim ds As New DataSet()
Dim XlsConnString As String = String.Empty
Dim DirPath As String = Server.MapPath("~/Temp_Upload/")
Dim fName As String
If (Directory.Exists(DirPath)) Then
For Each fName In Directory.GetFiles(DirPath)
If File.Exists(fName) Then
File.Delete(fName)
End If
Next
End If
If xlsUpload.HasFile Then
Dim fileName As String = Path.GetFileName(xlsUpload.PostedFile.FileName)
Dim fileExtension As String = Path.GetExtension(xlsUpload.PostedFile.FileName)
Dim fileLocation As String = Server.MapPath("~/Temp_Upload/" & fileName)
xlsUpload.SaveAs(fileLocation)
'Check whether file extension is xls or xslx
If fileExtension = ".xls" Then
XlsConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & fileLocation & ";Extended Properties=""Excel 8.0;HDR=Yes;IMEX=2"""
ElseIf fileExtension = ".xlsx" Then
XlsConnString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & fileLocation & ";Extended Properties=""Excel 12.0;HDR=Yes;IMEX=2"""
ElseIf fileExtension <> ".xls" Or fileExtension <> ".xlsx" Then
lblMessage.Text = "Upload file must be excel !"
Exit Sub
End If
Dim cmd As New SqlCommand : Dim SheetName As String 'Dim dr As SqlDataReader
'Dim tran As SqlTransaction
apps.OpenConnection()
cmd.Connection = apps.oConn
Dim cn As New OleDbConnection(XlsConnString)
Try
cn.Open()
Catch ex As OleDbException
Console.WriteLine(ex.Message)
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
' It Represents Excel data table Schema.
Dim dt As New System.Data.DataTable()
dt = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, Nothing)
If dt IsNot Nothing OrElse dt.Rows.Count > 0 Then
For sheet_count As Integer = 1 To dt.Rows.Count - 1
Try
' Create Query to get Data from sheet.
SheetName = dt.Rows(sheet_count)("table_name").ToString()
'Dim da As New OleDbDataAdapter("SELECT * FROM [" & sheetname & "]", cn)
'da.Fill(ds, sheetname)
'Execute a query to erase any previous data from our destination table
cmd.CommandText = "Truncate Table Temp_" & SheetName
cmd.ExecuteNonQuery()
'Series of commands to bulk copy data from the excel file into our SQL table
Dim OleDbConn As OleDbConnection = New OleDbConnection(XlsConnString)
Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT * FROM [" & SheetName & "]"), OleDbConn)
'Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT * FROM [Customer$]"), OleDbConn)
OleDbConn.Open()
Dim OleDbRead As OleDbDataReader = OleDbCmd.ExecuteReader()
Dim bulkCopy As SqlBulkCopy = New SqlBulkCopy(apps.oConn)
bulkCopy.DestinationTableName = "Temp_" & SheetName
bulkCopy.WriteToServer(OleDbRead)
OleDbConn.Close()
OleDbConn = Nothing
Catch ex As DataException
Console.WriteLine(ex.Message)
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
Next
End If
cn.Close()
cn = Nothing
apps.CloseConnection()
End If
End Sub
End Class

Answer 1

The line that reads
For sheet_count As Integer = 1 To dt.Rows.Count - 1
should either be
For sheet_count As Integer = 0 To dt.Rows.Count - 1
or
For sheet_count As Integer = 1 To dt.Rows.Count
The first one I suspect, but I can't remember if this is a zero based list as I haven't got VB.Net installed here.
Incidentally there's no need to check the file extension is .xls and then to use the Jet provider, Microsoft.ACE.OLEDB.12.0 will work just fine on .xls files.