datetime value problem

Question

1.00/5 (1 vote)

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Dear sir/ma'am

i am taking date from a text box while i am using webapplication.

but problem i found as
String was not recognized as a valid DateTime.

i am using as

VB

Dim dt1 As DateTime
dt1 = DateTime.ParseExact(Convert.ToDateTime(Me.txt_frmdate.Text), "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture)

here txt_frmdate is a text box in which i choose the date from calender extender

Posted 2-Jun-13 17:13pm

ankur789

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-06-02T18:01:00

In addition to Solution 1:

Look at other method of the structure System.DateTime: Parse, ParseExact, TryParse and TryParseExact, all of them:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

The have different signatures and allow to choose either exact format string, culture, or both, the method started with "Try" don't throw exception, but return Boolean value in case of success. Each of the MSDN help pages on each method comes with a clear code sample.
Learn format specifiers:
http://msdn.microsoft.com/en-us/library/az4se3k1.aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

Besides, it's not so good to use text input for time. I would advise to use DateTimePicker instead:
http://www.codeproject.com/KB/webforms/DateTimePicker.aspx[^].

—SA

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-06-02T17:35:00

Solution 1

Refer - DateTime.ParseExact Method (String, String, IFormatProvider)[^].

Quote:
Converts the specified string representation of a date and time to its DateTime equivalent using the specified format and culture-specific format information. The format of the string representation must match the specified format exactly.

But you have converted the string to date and then passed it inside this ParseExact Function as the first parameter.

So, try like below...

C#

Dim dt1 As DateTime
dt1 = DateTime.ParseExact(Me.txt_frmdate.Text, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture)

Posted 2-Jun-13 17:35pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

Sergey Alexandrovich Kryukov 3-Jun-13 0:05am

It could be enough to solve the problem, but in most cases, specifying both culture and format would be redundant. The answer need a bit more detail. I voted 4 this time.

I added some detail, and, more importantly, a better alternative. Please see Solution 2.

—SA

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:35am

Yes you are right... My +5 for you, but I can't see my +4. :P

Sergey Alexandrovich Kryukov 3-Jun-13 1:38am

Thank you, Tadit.
Ah, sorry, I forgot, put it now. Please, don't hesitate to remind; such things happen.
—SA

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:43am

No problem... Yeah I will remind... :D :P

ankur789 3-Jun-13 0:19am

sir same problem is also find in the
Dim dt1 As DateTime
dt1 = DateTime.ParseExact(Me.txt_frmdate.Text, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:36am

Can you check the value of Me.txt_frmdate.Text while debugging ?

Sergey Alexandrovich Kryukov 3-Jun-13 1:39am

What's the use? We don't see your data. And I advise you to look at my answer and stop using text box for this purpose.
—SA

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:48am

Actually he is using the calender extender and that extends to an textbox.
But the value is blank, you can see his comment.

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/Calendar/Calendar.aspx

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:52am

I have suggested him to use what you have advised.

ankur789 3-Jun-13 1:41am

sir now blank date i found while debug but in the form i already select the date which is display in textbox

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:51am

That means there are some other issues. Can you use the DateTimepicker suggested by Sergey Alexandrovich Kryukov once?

ankur789 3-Jun-13 1:51am

yes Tadit sir exactly you are right i am doing as you think
sir please help me

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:54am

Can you show the Markup? I mean the aspx page.

ankur789 3-Jun-13 1:55am

sir in the web page toolbox there is no datetimepicker
sir while i am working in window application i am always using datetimepiker but in web no datetime picker is there in the toolbox so i am using calender extender with textbox

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 1:57am

No, I was referring the DateTimePicker link Sergey has given in his answer.

Anyway, post the current aspx page code.

ankur789 3-Jun-13 1:57am

<asp:TextBox ID="txt_frmdate" runat="server" Width="152px" ReadOnly="True">
<cc1:calendarextender id="CalendarExtender1" TargetControlID="txt_frmdate" Format="dd/MM/yyyy" runat="server">

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 2:02am

When you select any date from Calendar, is it showing in TextBox ?

ankur789 3-Jun-13 1:57am

complete page is

<%@ Page Language="VB" MasterPageFile="~/MasterPage2.master" AutoEventWireup="false" CodeFile="Student Application.aspx.vb" Inherits="Student_Application" title="Untitled Page" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="studPlaceHolder1" Runat="Server">
<script language="javascript" type="text/javascript">
// <!CDATA[

function TABLE1_onclick() {

}

// ]]>
</script>

<table style="width: 464px; border-top-style: none; border-right-style: none; border-left-style: none;">
<tr>
<td style="width: 85px; height: 22px;">
</td>
<td style="width: 100px; height: 22px;">
<asp:Label id="lb_active" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Maroon" Text="Student is not Active" Visible="False" Width="160px"><asp:Label id="lb_empty" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Maroon" Text="Roll No Fields ca'nt Leave Empty" Visible="False" Width="272px"></td>
<td style="width: 100px; height: 22px">
<asp:Label ID="lb_sub" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Maroon" Text="Request Has Been Submitted" Visible="False" Width="192px"></td>
</tr>
<tr>
<td style="width: 85px; height: 20px">
<asp:Label id="lb_stud_roll_no" runat="server" Font-Bold="True" Font-Names="Arial"
Font-Size="Larger" ForeColor="Black" Text="Student Roll No" Width="176px"></td>
<td style="width: 100px; height: 20px">
<asp:TextBox id="txt_stud_roll_no" runat="server" BorderStyle="Inset" Width="256px" Height="32px" OnTextChanged="txt_stud_roll_no_TextChanged"></td>
<td colspan="2" style="height: 20px; width: 142px;">
<asp:Button id="btn_get" runat="server" BackColor="Black" BorderStyle="None" OnClick="btn_get_Click"
Text="Get Record" Width="136px" Height="24px" Font-Bold="True" ForeColor="#E0E0E0" /></td>
</tr>
</table>
<br />
<table>
<tr>
<td style="width: 100px; height: 26px;">
<asp:Label id="Label1" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Student Name" Width="176px"></td>
<td style="width: 100px; height: 26px;">
<asp:TextBox id="txt_stud_name" runat="server" Width="128px">
</td>
<td style="width: 100px; height: 26px;">
</td>
<td style="width: 100px; height: 26px;">
</td>
<td colspan="2" rowspan="5">
<asp:Image
ID="img_stud" runat="server" Height="40px" Width="24px" />

</td>
</tr>
<tr>
<td style="width: 100px">
<asp:Label id="Label2" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Father Name" Width="176px"></td>
<td style="width: 100px">
<asp:TextBox id="txt_father_name" runat="server" Width="128px">
<

ankur789 3-Jun-13 1:58am

</td>
<td style="width: 100px">
</td>
<td style="width: 100px">
</td>
</tr>
<tr>
<td style="width: 100px">
<asp:Label id="Label3" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Phone No" Width="176px"></td>
<td style="width: 100px">
<asp:TextBox id="txt_p_no" runat="server" Width="128px">
</td>

</tr>
<tr>
<td style="width: 100px">
<asp:Label id="Label4" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Course" Width="176px"></td>
<td style="width: 100px">
<asp:TextBox id="txt_course" runat="server" Width="128px">
</td>
<td style="width: 100px">
<asp:Label id="Label7" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Student Type" Width="120px"></td>
<td style="width: 100px">
<asp:TextBox id="txt_stud_type" runat="server" Width="128px">
</td>
</tr>
<tr>
<td style="width: 100px; height: 26px">
<asp:Label id="Label5" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Branch" Width="120px"></td>
<td style="width: 100px; height: 26px">
<asp:TextBox id="txt_branch" runat="server" Width="128px">
</td>
<td style="width: 100px; height: 26px">
<asp:Label id="Label6" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Batch" Width="120px"></td>
<td style="width: 100px; height: 26px">
<asp:TextBox id="txt_batch" runat="server" Width="128px">
</td>
</tr>
</table>
<br />
<table style="width: 264px; height: 24px;" id="TABLE1" önclick="return TABLE1_onclick()">
<tr>
<td colspan="3" style="height: 20px; width: 107px;">
<asp:Label id="Label8" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="X-Large"
ForeColor="Maroon" Text="Leave Reason" Width="176px"></td>
</tr>
<tr>
<td colspan="3" style="height: 6px; width: 107px; text-align: left;" align="left">
<asp:Label id="Label9" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Why" Width="128px"></td>
<td colspan="3" style="height: 6px">
<asp:TextBox id="txt_why" runat="server" Width="560px">

</td>
</tr>
<tr>
<td colspan="3" style="height: 1px; width: 107px; text-align: left;" align="left">
<asp:Label id="Label10" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text="Where" Width="120px"><br />
</td>
<td colspan="1" style="height: 1px">
<asp:TextBox id="txt_where" runat="server" Width="192px"><br />
</td>
<td colspan="1" style="width: 3px; height: 1px">
<asp:Label id="Label11" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="Larger"
ForeColor="Black" Text=

ankur789 3-Jun-13 2:03am

yes sir in text box date is showing

ankur789 3-Jun-13 2:04am

but while debug my code in the message box MsgBox(txt_frmdate.Text)
value i find is blank

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 2:41am

Please refer - http://www.aspdotnet-suresh.com/2012/06/ajax-calendar-extender-control-example.html

and check if you have implemented the same way or not. Please look carefully.

ankur789 3-Jun-13 2:35am

sir now in the text box date is fetching but onle today date is fetch when i change the date from the calendern extender the changedate is displayed in the texbox but while debug the code message box shows today date only

ankur789 3-Jun-13 3:07am

yes sir i am implemented same way but at the code when debug today date is fetch only

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 3-Jun-13 3:11am

Can you give the project for reference ? I would like to check at my local.
Is it a huge project ? Will it debug at my local ?

If you can, then just upload to some sites like ge.tt and give me the link here.