/// 

/// Override the SaveData() function to reset the CheckSum for the record 
/// so that the record can be saved even if it was modified in the database.
/// CAUTION: We recommend you apply this customization only in very special circumstances.
/// 
public override void SaveData()
{
    // (re)set the current control's record's CheckSum to Nothing
    this.CheckSum = null;
    base.SaveData();
}