This is probably not the best way to do this, but if you really must do it this way consider defining and opening the connection in the calling routine and passing it into this routine as a parameter. It can then be closed in the calling routing, thus...
Sub Main()
Dim xConnStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;" & _
"Data Source=" & Server.MapPath(String.Format("~/Upload/{0}", fileName)) & ";" & _
"Extended Properties=Excel 8.0;"
Dim objXConn As New OleDbConnection(xConnStr)
objXConn.Open()
Dim ObjCommand As New OleDbCommand = ExcelConnection(objXConn)
'Whatever other operations you want to do with your returned OleDbCommand
...
objXConn.Close()
End Sub
Function ExcelConnection(PassedConnection As OleDbConnection) As OleDbCommand
Dim fileName As String = Session("newUploadedFile")
Dim objCommand As New OleDbCommand("SELECT Name FROM [Sheet1$]", PassedConnection)
Return objCommand
End Function
I posted something similar to this here... Best fastest way to read an Excel sheet