TemplateColumn tc1 = new TemplateColumn();
                tc1.ItemTemplate = new GridViewTextBoxTemplate(ListItemType.Item, "Column1");
                tc1.EditItemTemplate = new GridViewTextBoxTemplate(ListItemType.EditItem, "Column1");
                gridview1.Columns.Add(tc1);

public class GridViewTextBoxTemplate : ITemplate
    {
        //A variable to hold the type of ListItemType.
        ListItemType _templateType;
        //A variable to hold the column name.
        string _columnName;

        //Constructor where we define the template type and column name.
        public GridViewTextBoxTemplate(ListItemType type, string colname)
        {
            //Stores the template type.
            _templateType = type;
            //Stores the column name.
            _columnName = colname;
        }

        void ITemplate.InstantiateIn(System.Web.UI.Control container)
        {
            switch (_templateType)
            {
                case ListItemType.Header:
                    //Creates a new label control and add it to the container.
                    Label lbl = new Label();            //Allocates the new label object.
                    lbl.Text = _columnName;             //Assigns the name of the column in the lable.
                    container.Controls.Add(lbl);        //Adds the newly created label control to the container.
                    break;
                case ListItemType.Item:
                    //Creates a new text box control and add it to the container.
                    TextBox tb1 = new TextBox();                            //Allocates the new text box object.
                    tb1.Enabled = false;
                    tb1.DataBinding += new EventHandler(tb1_DataBinding);   //Attaches the data binding event.
                    tb1.Columns = 4;                                        //Creates a column with size 4.
                    container.Controls.Add(tb1);                            //Adds the newly created textbox to the container.
                    break;
                case ListItemType.EditItem:
                    //Creates a new text box control and add it to the container.
                    TextBox tb2 = new TextBox();                            //Allocates the new text box object.
                    tb2.DataBinding += new EventHandler(tb1_DataBinding);   //Attaches the data binding event.
                    tb2.Columns = 4;                                        //Creates a column with size 4.
                    container.Controls.Add(tb2);                            //Adds the newly created textbox to the container.
                    break;
                case ListItemType.Footer:
                    CheckBox chkColumn = new CheckBox();
                    chkColumn.ID = "Chk" + _columnName;
                    container.Controls.Add(chkColumn);
                    break;
            }
        }

        /// <summary>
        /// This is the event, which will be raised when the binding happens.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void tb1_DataBinding(object sender, EventArgs e)
        {
            TextBox txtdata = (TextBox)sender;
            GridViewRow container = (GridViewRow)txtdata.NamingContainer;
            object dataValue = DataBinder.Eval(container.DataItem, _columnName);
            if (dataValue != DBNull.Value)
            {
                txtdata.Text = dataValue.ToString();
            }
        }
    }

 BoundField fBoundFieldbf = new BoundField();

            fBoundFieldbf.DataField = DataField;
            fBoundFieldbf.HeaderText = HeaderText;
            fBoundFieldbf.HeaderStyle.HorizontalAlign = HeaderAling;
            fBoundFieldbf.ItemStyle.HorizontalAlign = ItemAling;
            fBoundFieldbf.Visible = isvisible;
            
            if (isDate)
                fBoundFieldbf.DataFormatString = "{0:dd MMMM yyyy}";


            gv.Columns.Add(fBoundFieldbf);