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

Overload List

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

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Function HasChanges() As Boolean

[C#] public bool HasChanges();

[C++] public: bool HasChanges();

[JScript] public function HasChanges() : Boolean;

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

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Function HasChanges(DataRowState) As Boolean

[C#] public bool HasChanges(DataRowState);

[C++] public: bool HasChanges(DataRowState);

[JScript] public function HasChanges(DataRowState) : Boolean;

Example

[Visual Basic, C#] The following example uses the GetChanges method to create a second DataSet object that is then used to update a data source.

[Visual Basic, C#] Note   This example shows how to use one of the overloaded versions of HasChanges. For other examples that might be available, see the individual overload topics.

[Visual Basic] 
Private Sub UpdateDataSet(ByVal myDataSet As DataSet)
   ' Check for changes with the HasChanges method first.
   If Not myDataSet.HasChanges(DataRowState.Modified) Then Exit Sub
   ' Create temporary DataSet variable.
   Dim xDataSet As DataSet
   ' GetChanges for modified rows only.
   xDataSet = myDataSet.GetChanges(DataRowState.Modified)
   ' Check the DataSet for errors.
   If xDataSet.HasErrors Then
      ' Insert code to resolve errors.
   End If
   ' After fixing errors, update the data source with the DataAdapter 
   ' used to create the DataSet.
   myOleDbDataAdapter.Update(xDataSet)
End Sub

[C#] 
private void UpdateDataSet(DataSet myDataSet){
   // Check for changes with the HasChanges method first.
   if(!myDataSet.HasChanges(DataRowState.Modified)) return;
   // Create temporary DataSet variable.
   DataSet xDataSet;
   // GetChanges for modified rows only.
   xDataSet = myDataSet.GetChanges(DataRowState.Modified);
   // Check the DataSet for errors.
   if(xDataSet.HasErrors){
      // Insert code to resolve errors.
   }
   // After fixing errors, update the data source with the DataAdapter 
   // used to create the DataSet.
   myOleDbDataAdapter.Update(xDataSet);
}

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button in the upper-left corner of the page.

See Also

DataSet Class | DataSet Members | System.Data Namespace