protected void uiButtonSearch_Click(object sender, EventArgs e) { BLL.News objData = new BLL.News(); objData.SearchNews(uiTextBoxSearch.Text, !string.IsNullOrEmpty(uiTextBoxFromDate.Text) ? DateTime.Parse(uiTextBoxFromDate.Text) : DateTime.ParseExact("01/01/1900", "dd/MM/yyyy", null) , !string.IsNullOrEmpty(uiTextBoxToDate.Text) ? DateTime.Parse(uiTextBoxToDate.Text) : DateTime.MaxValue); uiGridViewNews.DataSource = objData.DefaultView; uiGridViewNews.DataBind(); }