DataSet.HasChanges Method (DataRowState)

 

Gets a value indicating whether the DataSet has changes, including new, deleted, or modified rows, filtered by DataRowState.

Namespace:   System.Data
Assembly:  System.Data (in System.Data.dll)

Public Function HasChanges (
	rowStates As DataRowState
) As Boolean

Parameters

rowStates
Type: System.Data.DataRowState

One of the DataRowState values.

Return Value

Type: System.Boolean

true if the DataSet has changes; otherwise false.

Examine the HasChanges property of the DataSet before invoking the GetChanges method.

The following example uses the GetChanges method to create a second DataSet object, which is then used to update a data source.

Private Sub UpdateDataSet(ByVal dataSet As DataSet)
   ' Check for changes with the HasChanges method first.
   If Not dataSet.HasChanges(DataRowState.Modified) Then 
       Exit Sub
   End If

   ' Create temporary DataSet variable and
   ' GetChanges for modified rows only.
   Dim tempDataSet As DataSet = _
       dataSet.GetChanges(DataRowState.Modified)

   ' Check the DataSet for errors.
   If tempDataSet.HasErrors Then
      ' Insert code to resolve errors.
   End If

   ' After fixing errors, update the data source with   
   ' the DataAdapter used to create the DataSet.
   adapter.Update(tempDataSet)
End Sub

.NET Framework
Available since 1.1
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