place single text box single cell

 using GridView RowDataBound event.

 example:

 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
 {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
                HyperLink tmplnk1 = new HyperLink();
                tmplnk1 = (HyperLink)e.Row.Cells[1].FindControl("hyplnk1");
                if (e.Row.DataItemIndex != 3)
                {
                        tmplnk1.Visible = false;
                }
                tmplnk1 = null;
        }
 }