ColumnChanged Event

DataTable.ColumnChanged Event


Occurs after a value has been changed for the specified DataColumn in a DataRow.

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

public event DataColumnChangeEventHandler ColumnChanged

For more information, see Handling DataTable Events.

private static void DataTableColumnChanged()
    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 ColumnChanged event handler for the table.
    custTable.ColumnChanged += new 
        DataColumnChangeEventHandler(Column_Changed );

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


    // 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 Column_Changed(object sender, DataColumnChangeEventArgs e )
    Console.WriteLine("Column_Changed Event: name={0}; Column={1}; original name={2}", 
        e.Row["name"], e.Column.ColumnName, e.Row["name", DataRowVersion.Original]);

.NET Framework
Available since 1.1
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