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 bool HasChanges(
	DataRowState 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 void UpdateDataSet(DataSet dataSet)
{
    // Check for changes with the HasChanges method first.
    if(!dataSet.HasChanges(DataRowState.Modified)) return;

    // Create temporary DataSet variable and
    // GetChanges for modified rows only.
    DataSet tempDataSet = 
        dataSet.GetChanges(DataRowState.Modified);

    // Check the DataSet for errors.
    if(tempDataSet.HasErrors)
    {
        // Insert code to resolve errors.
    }
    // After fixing errors, update the data source with  
    // the DataAdapter used to create the DataSet.
    adapter.Update(tempDataSet);
}

.NET Framework
Available since 1.1
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