ToString, s ' syntax error here dtResult. What am I doing wrong? Tola Tola 2, 10 10 gold badges 35 35 silver badges 57 57 bronze badges. Add a comment. Active Oldest Votes. For instance you could write the following code to update the column "Foo" to be the value strVerse dtResult. JaredPar JaredPar k gold badges silver badges bronze badges. You can access columns by index, by name and some other ways : dtResult.
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The Update method of the DataAdapter is called to resolve changes from a DataSet back to the data source. The DataSet instance is the DataSet that contains the changes that have been made, and the DataTable identifies the table from which to retrieve the changes. This allows you to maximize the performance of your ADO. NET application by specifying command syntax at design time and, where possible, through the use of stored procedures.
You must explicitly set the commands before calling Update. If Update is called and the appropriate command does not exist for a particular update for example, no DeleteCommand for deleted rows , an exception is thrown.
This causes the rows affected count returned to be zero, which the DataAdapter interprets as a concurrency conflict. In this event, a DBConcurrencyException will be thrown. Command parameters can be used to specify input and output values for an SQL statement or stored procedure for each modified row in a DataSet.
For more information, see DataAdapter Parameters. It is important to understand the difference between deleting a row in a DataTable and removing the row. When you call the Remove or RemoveAt method, the row is removed immediately. Any corresponding rows in the back end data source will not be affected if you then pass the DataTable or DataSet to a DataAdapter and call Update. When you use the Delete method, the row remains in the DataTable and is marked for deletion.
If you then pass the DataTable or DataSet to a DataAdapter and call Update , the corresponding row in the back end data source is deleted. For more information, see Generating Commands with CommandBuilders.
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