How to parse a Date DateTime tg2 = DateTime.Parse(txtTG2.Text, System.Globalization.CultureInfo.CreateSpecificCulture("en-US")); How to parse date in a textBox using a calendar <asp:TextBox ID="txtTG4" runat="server" Text="" CssClass="capture" Style="width: 75px;" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator7" ControlToValidate="txtTG4" runat="server" ErrorMessage="*Required" CssClass="validator" ValidationGroup="save" /> <ajaxCTK:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtTG4" PopupPosition="TopLeft" /> ...