This documentation is archived and is not being maintained.

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)

'Declaration
Public Function HasChanges ( _
	rowStates As DataRowState _
) As Boolean
'Usage
Dim instance As DataSet 
Dim rowStates As DataRowState 
Dim returnValue As Boolean 

returnValue = instance.HasChanges(rowStates)

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
Show: