ASP.NET

public DataRowCollection RowDataSource
{
	get
    {
		if (ViewState["rowDataSource"] == null)
		{
	        ViewState["rowDataSource"] = null;
		}
        return (DataRowCollection)ViewState["rowDataSource"];
    }
	set
    {
		if (value == null)
		{
			throw new ArgumentException("unvalid data source.", this.ID);
		}
		ViewState["rowDataSource"] = value;
	}
}
public RowCollections ExelRows
{
   get
   {
   // rCollection is object of RowCollections class
	if (rCollection == null)
        {
           rCollection = new RowCollections();
        }
        return rCollection;

   }
}

OnDataBinding event code
protected override void OnDataBinding(EventArgs e)
{
	base.OnDataBinding(e);
	if (RowDataSource != null)
	{
		foreach (DataRow dr in RowDataSource)
		{
		    //RowItem is my class
			RowItem item = new RowItem();
			item.Text = dr[rTitle].ToString();
			this.ExelRows.Add(item);
		}
	}
}
   
CreateChildControls method to render control		 
protected override void CreateChildControls()
{
	if (ExelRows.Count > 0)
	{
		//here i am rendering table structure to add exelrows and create control.
	}
}