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DataTable.ColumnChanging Event
Visual Studio 2008
Occurs when a value is being changed for the specified DataColumn in a DataRow.
Assembly: System.Data (in System.Data.dll)
For more information, see Handling DataTable Events (ADO.NET).
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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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