DataTable.ColumnChanging Event
.NET Framework 3.0
Occurs when a value is being changed for the specified DataColumn in a DataRow.
Namespace: System.Data
Assembly: System.Data (in system.data.dll)
DataTable Members
System.Data Namespace
Assembly: System.Data (in system.data.dll)
'Declaration Public Event ColumnChanging As DataColumnChangeEventHandler 'Usage Dim instance As DataTable Dim handler As DataColumnChangeEventHandler AddHandler instance.ColumnChanging, handler
/** @event */ public void add_ColumnChanging (DataColumnChangeEventHandler value) /** @event */ public void remove_ColumnChanging (DataColumnChangeEventHandler value)
In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.
For more information, see Working with DataTable Events.
Private Shared Sub DataTableColumnChanging() 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 ColumnChanging event handler for the table. AddHandler custTable.ColumnChanging, New _ DataColumnChangeEventHandler(AddressOf Column_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 Shared Sub Column_Changing(sender As Object, _ e As DataColumnChangeEventArgs) Console.WriteLine( _ "Column_Changing Event: name={0}; Column={1}; proposed name={2}", _ e.Row("name"), e.Column.ColumnName, e.ProposedValue) End Sub
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Reference
DataTable ClassDataTable Members
System.Data Namespace
Other Resources
Creating and Using DataTablesCommunity Additions
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