My error is string was not recognized as a valid DateTime

Question

I'm having this error if i leave the date blank when I click save button.

Front Code

Date

<asp:TextBox ID="txtDate" runat="server" CssClass="text_300" MaxLength="200"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtDate" Format="dd/MM/yyyy"></asp:CalendarExtender>
<asp:MaskedEditExtender TargetControlID="txtDateFrom" Mask="99/99/9999"
    MessageValidatorTip="true" OnFocusCssClass="MaskEditFocus" OnInvalidCssClass="MaskEditError"
    MaskType="Date"
    ErrorTooltipEnabled="True" runat="server" ID="mskD" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
    ErrorMessage="*" ControlToValidate="txtDate" SetFocusOnError="True"></asp:RequiredFieldValidator>

Back Code

string result = _bllstaff.addInfo(Convert.ToDateTime(this.txtDateFrom.Text == "" 
    ? 0.ToString() : this.txtDateFrom.Text), _pUser.IDUSER, 
    DateTime.Now, dtCurrentTable);

This error occurs if I leave it blank after click save button. Maybe you guys have idea or suggestion for me. Thank you.

Answer 1

It's hard to understand exactly what issue you are having. Maybe revising your question, posting more code, and using a code block will help. EDIT: (I see the question has been updated)

I'll attempt a suggestion however; My advice would be to use the DateTime.Parse method, or even better DateTime.TryParse and make the code easier to follow:

//...
DateTime date = DateTime.MinValue;
DateTime.TryParse(this.txtDateFrom.Text, out date);
string result = _bllstaff.addInfo(date, _pUser.IDUSER, DateTime.Now, dtCurrentTable);
//...