/// <summary> /// /// </summary> public class ListControlTable : DataTable,System.Collections.IEnumerable { /// <summary> /// /// </summary> public ListControlTable():base("ListControlTable") { this.InitClass(); }

    /// <summary>
    /// 
    /// </summary>
    public DataColumn DisplayColumn
    {
        get{ return this.Columns["displayColumn"]; }
    }

    /// <summary>
    /// 
    /// </summary>
    public DataColumn ValueColumn
    {
        get{ return this.Columns["valueColumn"]; }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    public System.Collections.IEnumerator GetEnumerator() 
    {
        return this.Rows.GetEnumerator();
    }

    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    public override DataTable Clone() 
    {
        ListControlTable cln = (ListControlTable)base.Clone();
        return cln;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="SourceTable"></param>
    /// <param name="ValueColumn"></param>
    /// <param name="DisplayColumn"></param>
    /// <param name="Refill"></param>
    /// <param name="InsertNull"></param>
    /// <param name="NullText"></param>
    public void Fill(DataTable SourceTable,DataColumn ValueColumn,
        DataColumn DisplayColumn,bool Refill,bool InsertNull,string NullText)
    {
        foreach(DataRow row in SourceTable.Rows)
        {
            object[] rowArray = new object[3];
            rowArray[0] = (row.ItemArray[ValueColumn.Ordinal].Equals(DBNull.Value))
                ? 0 : row.ItemArray[ValueColumn.Ordinal];
            rowArray[1] = row.ItemArray[ValueColumn.Ordinal];
            rowArray[2] = row.ItemArray[DisplayColumn.Ordinal];
            if(!Refill) this.Rows.Add(rowArray);
            else
            {
                this.BeginLoadData();
                this.LoadDataRow(rowArray,true);
                this.EndLoadData();
            }
        }

        if(InsertNull)
        {
            DataRow row = this.NewRow();
            this.Rows.Add(new object[] {0,DBNull.Value,NullText});
        }

        this.DefaultView.Sort = "displayColumn";
    }

    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    protected override DataTable CreateInstance() 
    {
        return new ListControlTable();
    }

    private void InitClass()
    {
        this.Columns.Add(new DataColumn("valueColumnKey",typeof(int),
            null,System.Data.MappingType.Element));
        this.Columns.Add(new DataColumn("valueColumn",typeof(int),
            null,System.Data.MappingType.Element));
        this.Columns.Add(new DataColumn("displayColumn",typeof(string),
            null,System.Data.MappingType.Element));

        //This is needed for the DataTable.LoadDataRow() method.
        this.PrimaryKey = new DataColumn[] {this.Columns["valueColumnKey"]};
    }
}