DataTable.RowChanging Event

public:
 event System::Data::DataRowChangeEventHandler ^ RowChanging;

public event System.Data.DataRowChangeEventHandler? RowChanging;

public event System.Data.DataRowChangeEventHandler RowChanging;

[System.Data.DataSysDescription("DataTableRowChangingDescr")]
public event System.Data.DataRowChangeEventHandler RowChanging;

member this.RowChanging : System.Data.DataRowChangeEventHandler 

[<System.Data.DataSysDescription("DataTableRowChangingDescr")>]
member this.RowChanging : System.Data.DataRowChangeEventHandler 

Public Custom Event RowChanging As DataRowChangeEventHandler 

Event Type

Attributes

DataSysDescriptionAttribute

Examples

private static void DataTableRowChanging()
{
 DataTable custTable = new DataTable("Customers");
 // add columns
 custTable.Columns.Add("id", typeof(int));
 custTable.Columns.Add("name", typeof(string));
 custTable.Columns.Add("address", typeof(string));

 // set PrimaryKey
 custTable.Columns[ "id" ].Unique = true;
 custTable.PrimaryKey = new DataColumn[] { custTable.Columns["id"] };

 // add a RowChanging event handler for the table.
 custTable.RowChanging += new DataRowChangeEventHandler(Row_Changing);

 // add ten rows
 for(int id=1; id<=10; id++)
 {
 custTable.Rows.Add(
 new object[] { id, string.Format("customer{0}", id),
 string.Format("address{0}", id) });
 }
 
 custTable.AcceptChanges();

 // change the name column in all the rows
 foreach(DataRow row in custTable.Rows)
 {
 row["name"] = string.Format("vip{0}", row["id"]);
 }
}

private static void Row_Changing(object sender, DataRowChangeEventArgs e)
{
 Console.WriteLine("Row_Changing Event: name={0}; action={1}",
 e.Row["name"], e.Action);
}

 Private Sub DataTableRowChanging()
 Dim custTable As New DataTable("Customers")
 ' add columns
 custTable.Columns.Add("id", Type.GetType("System.Int32"))
 custTable.Columns.Add("name", Type.GetType("System.String"))
 custTable.Columns.Add("address", Type.GetType("System.String"))

 ' set PrimaryKey
 custTable.Columns("id").Unique = True
 custTable.PrimaryKey = New DataColumn() {custTable.Columns("id")}

 ' add a RowChanging event handler for the table.
 AddHandler custTable.RowChanging, _
 New DataRowChangeEventHandler(AddressOf Row_Changing)


 ' add ten rows
 Dim id As Integer
 For id = 1 To 10
 custTable.Rows.Add( _
New Object() {id, String.Format("customer{0}", id), _
 String.Format("address{0}", id)})
 Next

 custTable.AcceptChanges()

 ' change the name column in all the rows
 Dim row As DataRow
 For Each row In custTable.Rows
 row("name") = String.Format("vip{0}", row("id"))
 Next

 End Sub

 Private Sub Row_Changing(ByVal sender As Object, _
 ByVal e As DataRowChangeEventArgs)
 Console.WriteLine("Row_Changing Event: name={0}; action={1}", _
 e.Row("name"), e.Action)
 End Sub

Remarks

For more information, see Handling DataTable Events.

See also

• DataTables