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cn = new OdbcConnection("Driver={Microsoft Access Driver (*.mdb)};" +
          "DBQ=" + path + ";UID=;PWD=;");					

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cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source = " + path);					

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msg = "SELECT * " +
          "FROM ApplSettings_Apod " +
          "WHERE ProbeID = " + name + " AND ApplicationID = " + comboBoxApplication.SelectedItem.ToString();
        dt2 = new DataTable();
        ap2 = new OleDbDataAdapter(msg,cn);
        ap2.Fill(dt2);
        dataGrid1.DataSource = dt2;					

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foreach (DataRow row in dt2.Rows) 
        {
          ap2.UpdateCommand = new OleDbCommand("UPDATE ApplSettings_Apod",cn);
          dt2.AcceptChanges();
        }					

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hab das mitn update jetzt gemacht - schaut so aus:

        foreach(DataRow row in dt2.Rows) 
        {
          string rowSt = row.RowState.ToString();
          //string strID = row["ProbeID"].ToString();

          if(rowSt.Equals("Modified"))
            //if(strID == "50332172") 
          {
            string id = row[0].ToString();
            string id2 = row[1].ToString();

            string msg = "UPDATE ApplSettings_SRI " +
              "SET " +
              "ProbeID =" + id + "," +
              "ApplicationID =" + id2;
            ap2.UpdateCommand = new OleDbCommand(msg,cn);
            DataTable changes = dt2.GetChanges();
            ap2.Update(changes);
          }
        }