why can't update database

[ekkapop]

this code is work (can update my database)

Dim dt = DataSet11.Tables("Customer")
        dt.Rows(myMgr.Position)("CustomerPersonalID") = [COLOR=Red]1234567890[/COLOR]
 
        OleDbDataAdapter1.Update(DataSet11, "Customer")
        DataSet11.AcceptChanges()

but this code can't update my database

Dim dt = DataSet11.Tables("Customer")
        dt.Rows(myMgr.Position)("CustomerPersonalID") = [COLOR=Red]txtCustomerPersonalID.Text[/COLOR]
 
        OleDbDataAdapter1.Update(DataSet11, "Customer")
        DataSet11.AcceptChanges()

was i do wrong ?
thanks!