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DataTable.ColumnChanging Event
Visual Studio 2010
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 SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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