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Working with DataSet Events 

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The DataSet provides a MergeFailed event that is raised when the schema of the DataSet objects being merged are in conflict. For example, if the primary key columns of a table being merged differ between the tables in the two DataSet objects, an exception is thrown and the MergeFailed event is raised. The MergeFailedEventArgs passed to the MergeFailed event have a Conflict property that identifies the conflict in schema between the two DataSet objects, and a Table property that identifies the name of the table in conflict.

For information about other events available when working with a DataSet, see Working with DataTable Events and Working with DataAdapter Events.

The following code example adds the MergeFailed event to an event handler.

Dim workDS As DataSet = New DataSet

AddHandler workDS.MergeFailed, New MergeFailedEventHandler( _
  AddressOf DataSetMergeFailed)

Private Shared Sub DataSetMergeFailed(  _
  sender As Object,args As MergeFailedEventArgs)
  Console.WriteLine("Merge failed for table " & args.Table.TableName)
  Console.WriteLine("Conflict = " & args.Conflict)
End Sub

DataSet workDS = new DataSet();

workDS.MergeFailed += new MergeFailedEventHandler(DataSetMergeFailed);

private static void DataSetMergeFailed(
  object sender, MergeFailedEventArgs args)
{
  Console.WriteLine("Merge failed for table " + args.Table.TableName);
  Console.WriteLine("Conflict = " + args.Conflict);
}

See Also

Reference

DataSet Class
MergeFailedEventArgs Class
PropertyChangedEventArgs Class

Other Resources

Using DataSets in ADO.NET