>I have a form with a few textboxes that bound to SQL data, when I type the into the textboxes, the data got saved correctly. However, when I programmatically set the "Text" property, the data wasn't saving.
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>I tried to set the value in mmBusinessObject.DataRow but I got error. Can you tell me what is mmBusinessObject.DataRow because I can't find it in the Doc?

The DataRow property is new and it contains the current DataRow of the current business object DataSet. Check out the Dev Guide topic "Data Binding Web Controls to Alternate Data Sources".

Regards,