RowChanging Event
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DataTable.RowChanging Event

Occurs when a DataRow is changing.

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

'Declaration
Public Event RowChanging As DataRowChangeEventHandler
'Usage
Dim instance As DataTable
Dim handler As DataRowChangeEventHandler

AddHandler instance.RowChanging, handler

/** @event */
public void add_RowChanging (DataRowChangeEventHandler value)

/** @event */
public void remove_RowChanging (DataRowChangeEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

For more information, see Working with DataTable Events.

 Private Sub DataTableRowChanging()
     Dim custTable As DataTable = 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

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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