Strange errors when making queries to excel - vb.net

Question

Im making an application in vb.net to connect to an Excel file and edit it.
At the moment attempting to modify the Excel file ,the following errors appear:
With this function
Protected Friend Function obtenerHojaActual(ByVal columna As String, ByVal con As String) As String
Dim cmd As String
Dim WorkSheet As String = ""
Try
libro = app.Workbooks.Open(con)
For Each hoja As Microsoft.Office.Interop.Excel.Worksheet In libro.Worksheets
cmd = "SELECT [" & columna & "] FROM [" & hoja.Name & "$]"
Dim adapter As New OleDbDataAdapter(cmd, conexion)
Dim tabla As New DataTable
adapter.Fill(tabla)
adapter.Dispose()
//Code
//Code
//Code
tabla.Dispose()
Next
libro.Close()
app.Quit()
Return WorkSheet
Catch ex As Exception
repairmanMessage("Error inesperado", ex.Message, My.Resources._error).ShowDialog()
principal.lbldireccion.ForeColor = Color.Red
Return WorkSheet
End Try
End Function
Got this:
"No specified values ​​for some of the parameters required"
And with this:
Protected Friend Function obtenerErrores(ByVal columna As String, ByVal hoja As String, ByVal tipo As String) As Integer
Dim cmd As String = "SELECT [" & columna & "] FROM [" & hoja & "$]"
Dim errores As Integer = 0
Dim fecha As Date
Dim tabla As New DataTable
Try
Dim adapter As New OleDbDataAdapter(cmd, conexion)
adapter.Fill(tabla)
adapter.Dispose()
//Code
//Code
//Code
tabla.Dispose()
Return errores
Catch ex As Exception
repairmanMessage("Error inesperado", ex.Message, My.Resources._error).ShowDialog()
principal.lbldireccion.ForeColor = Color.Red
Return errores
End Try
Get this error...
I tried using parameterized queries, but looks like excel dont works fine with that thing (or maybe, i dont know the syntax of the query of that to use with excel).
The strangest thing of all is that in other parts of the code , do not give me errors , the program just throws errors when Im trying to modify the file, and
although I get these two errors , excel sheet is modified just as I wanted ..
What can be ?

Answer 1

Ok , I sat down to check everything and I had to think a little about what was happening. I discovered that my code did not have any error (that's why even though the program gave me errors , the file is modified anyway)... and discovered this too, let me explain it with an Excel file example:
Im using in my connection string the HDR property ("HDR=Yes;" indicates that the first row contains columnnames, not data. "HDR=No;" indicates the opposite.) as you can see , I have defined 4 columns (Name, Last name, Date, Age... not more! ).
We run the program now with this sample file and look carefully what happens:
As we saw in the first picture , I've never created a column in that position ('F1') ... apparently , there are times where you create without realizing it what I call "phantom columns " in Excel . I imagine it as the first cell of the column has nothing written on it , the program automatically gives it its name, according to their position ('F1 ' is the ghost column).
To fix this problem , when I make a query, first I check if my parameter "column " is not empty.
Protected Friend Function obtenerHojaActual(ByVal columna As String, ByVal con As String) As String
If (Not String.IsNullOrEmpty(columna)) Then
//Blah blah
//Blah blah
//Blah blah
End If
Return "Desconocida"
End Function
And there we go!