adding new coloumn to gridview with data.

// This is a class DynamicGridViewTextTemplate which inherits ITemplate interface to create a new column for a gridview

public class DynamicGridViewTextTemplate : ITemplate
{
	string _ColName;
	DataControlRowType _rowType;
	int _Count;


	public DynamicGridViewTextTemplate(string ColName, DataControlRowType RowType)
	{
		_ColName = ColName;
		_rowType = RowType;
	}

	public DynamicGridViewTextTemplate(DataControlRowType RowType, int ArticleCount)
	{
		_rowType = RowType;
		_Count = ArticleCount;
	}

	public void InstantiateIn(System.Web.UI.Control container)
	{
		switch (_rowType)
		{
			case DataControlRowType.Header:
				Label lc = new Label();
				lc.Text = _ColName;
				container.Controls.Add(lc);
				break;
			case DataControlRowType.DataRow:
				Label lbl = new Label();
				lbl.DataBinding += new EventHandler(this.lbl_DataBind);
				container.Controls.Add(lbl);
				break;
			case DataControlRowType.Footer:
				Label flc = new Label();
				container.Controls.Add(flc);
				break;
			default:
				break;
		}
	}

	private void lbl_DataBind(Object sender, EventArgs e)
	{
		Label lbl = (Label)sender;
		GridViewRow row = (GridViewRow)lbl.NamingContainer;
		lbl.Text = DataBinder.Eval(row.DataItem, _ColName).ToString();
	}
}

// Adds extra  columns to gridview, here Im adding 0th column of datatable at XXXXth column of  the gridview
private void AddColumns(DataTable dt)
{
	TemplateField tf;
	for (int i = 0; i < dt.Rows.Count; i++)
	{ 
            tf = new TemplateField();
	    tf.HeaderText = "Col Header";
	    tf.HeaderTemplate = new DynamicGridViewTextTemplate(Convert.ToString(dt.Rows[i][0]), DataControlRowType.Header);
	    tf.HeaderStyle.CssClass = "gridHeader";
	    tf.ItemTemplate = new DynamicGridViewTextTemplate(Convert.ToString(dt.Rows[i][0]), DataControlRowType.DataRow);
	    gridView.Columns.Insert(XXXX, tf);
	}
}