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ColumnChanging Event

DataTable.ColumnChanging Event

Occurs when a value is being changed for the specified DataColumn in a DataRow.

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

public event DataColumnChangeEventHandler ColumnChanging

    private static void DataTableColumnChanging()
    {
        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 ColumnChanging event handler for the table.
        custTable.ColumnChanging += new 
            DataColumnChangeEventHandler(Column_Changing );


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

        // 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_Changing(object sender, 
        DataColumnChangeEventArgs e )
    {
        Console.WriteLine(
            "Column_Changing Event: name={0}; Column={1}; proposed name={2}", 
            e.Row["name"], e.Column.ColumnName, e.ProposedValue );
    }

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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