full code, If helps:
Dim cn As ADODB.Connection
Dim rs As ADODB.Recordset
Dim strSQL As String
Dim codcad As Integer 'contra codigo do registro
Dim n As Long
Set cn = New ADODB.Connection
Set rs = New ADODB.Recordset
cn.ConnectionString = _
"Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & strDB & ";" & _
"Extended Properties=Excel 8.0"
cn.CursorLocation = adUseClient
cn.Open
strSQL = "SELECT * FROM [tblcadprocesso$]"
Set rs = cn.Execute(strSQL)
rs.MoveLast
codcad = rs.Fields(0)
codcad = codcad + 1
strSQL = ""
strSQL = "INSERT INTO [tblcadprocesso$] " & _
"(CODIGOC, CSRD, CPROCNUM, CPROCASS, CDATA) " & _
"VALUES " & codcad & ", " & txtSRD.Text & ", " & txtProcesso.Text & ", " & _
"" & txtAssunto.Text & ", " & txtData.Text & ""
cn.Execute (strSQL)
cn.Close
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