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Convert.ToDateTime

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SNegussie@aol.com

Hi,

I'm using Convert.ToDateTime to convert a string representation of a date in
a TextBox. Here is what I'm doing:

DateTime cvDate;
cvDate = Convert.ToDateTime(textbox.Text);

This works fine if there is data in the text box, but fails if there is not
data in the text. So I want to check for the presence of data in the text
box before I do the conversion. So I check for the length of the textbox
value and perform the conversion if it contains text.

if (textbox.Text.Length !=0)
cvDate = Convert.ToDateTime(textBox.Text);
else
I want to set cvDate to null. How do I do that? I get an error when
I do

cvDate = null;

Thanks
S

DateTime. It works

Reply to this message...

Brian W. Spolarich

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DQoNCg==

Reply to this message...

Stephen Rees

I'd set it to date time MinValue.
or
new System.DateTime(1900,01,01)

If you really need a null in the db then just say if cvdate == minvalue,
update db set date = null.

In other words, I can't seem to see a null/empty value in datetime either.

Steve.
-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: 06 July 2002 23:51
To: aspngcs
Subject: [aspngcs] Convert.ToDateTime

Hi,

I'm using Convert.ToDateTime to convert a string representation of a date
in a TextBox. Here is what I'm doing:

DateTime cvDate;
cvDate = Convert.ToDateTime(textbox.Text);

This works fine if there is data in the text box, but fails if there is
not data in the text. So I want to check for the presence of data in the
text box before I do the conversion. So I check for the length of the
textbox value and perform the conversion if it contains text.

if (textbox.Text.Length !=0)
cvDate = Convert.ToDateTime(textBox.Text);
else
I want to set cvDate to null. How do I do that? I get an error
when I do

cvDate = null;

Thanks
S

DateTime. It works | [aspngcs] member Click here to reveal e-mail address = YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

Reply to this message...

Michael Wells

While I favor a stricter use of types, I tend to use objects in this
case. An object allows for nulls and storage of DateTimes, and with
reasonable discipline in your coding, you should have no real
side-effects.
=20
If you use DateTimes extensively with ADO.NET, you might also consider
developing a class to manage this, or at least consider partitioning
your validation & conversion code into some functions. =20

-----Original Message-----
From: Stephen Rees [mailto:Click here to reveal e-mail address]
Sent: Sunday, July 07, 2002 12:07 PM
To: aspngcs
Subject: [aspngcs] RE: Convert.ToDateTime

I'd set it to date time MinValue.
or=20
new System.DateTime(1900,01,01)

If you really need a null in the db then just say if cvdate =3D=3D =
minvalue,
update db set date =3D null.
=20
In other words, I can't seem to see a null/empty value in datetime
either.
=20
Steve.

-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: 06 July 2002 23:51
To: aspngcs
Subject: [aspngcs] Convert.ToDateTime

Hi,=20

I'm using Convert.ToDateTime to convert a string representation of a
date in a TextBox. Here is what I'm doing:=20

DateTime cvDate;=20
cvDate =3D Convert.ToDateTime(textbox.Text);=20

This works fine if there is data in the text box, but fails if there is
not data in the text. So I want to check for the presence of data in
the text box before I do the conversion. So I check for the length of
the textbox value and perform the conversion if it contains text.=20

if (textbox.Text.Length !=3D0)=20
cvDate =3D Convert.ToDateTime(textBox.Text);=20
else=20
I want to set cvDate to null. How do I do that? I get an error
when I do=20

cvDate =3D null;=20

Thanks=20
S=20

DateTime. It works | [aspngcs] member Click here to reveal e-mail address =3D YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp =3D JOIN/QUIT=20

| [aspngcs] member Click here to reveal e-mail address =3D YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp =3D JOIN/QUIT=20

Reply to this message...

Tim Musschoot

Whey convert it to NULL. This is not a valid timestamp...

I use this code:

DateTime cvDate;
try{
    cvDate =3D DateTime.Parse(textbox.Text);
}
catch
{
    cvDate =3D DateTime.Now;
}

This assurs you ALWAYS have a legal datetime value. You can use a =
boolean to mark the usefullness of the date.... :

DateTime cvDate;
bool b_cvDate;
try{
    cvDate =3D DateTime.Parse(textbox.Text);
    b_cvDate =3D true;
}
catch
{
    cvDate =3D DateTime.Now;
    b_cvDate =3D false;
}

-----Oorspronkelijk bericht-----
Van: Brian W. Spolarich [mailto:Click here to reveal e-mail address]
Verzonden: zondag 7 juli 2002 18:10
Aan: aspngcs
Onderwerp: [aspngcs] RE: Convert.ToDateTime

This is sort of a problem in the .NET framework: how to represent an =
uninitialized or null valued DateTime.
=20
See =
http://discuss.develop.com/archives/wa.exe?S2=3Ddotnet&L=3DDOTNET&q=3D&s=3D=
datetime+null&f=3D&a=3D&b=3D
=20
for a discussion on this topic.
=20
Regards,
=20
-bws

    -----Original Message-----=20
    From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]=20
    Sent: Sat 7/6/2002 6:50 PM=20
    To: aspngcs=20
    Cc:=20
    Subject: [aspngcs] Convert.ToDateTime
=09
=09
    Hi,=20
=09
    I'm using Convert.ToDateTime to convert a string representation of a =
date in a TextBox. Here is what I'm doing:=20
=09
    DateTime cvDate;=20
    cvDate =3D Convert.ToDateTime(textbox.Text);=20
=09
    This works fine if there is data in the text box, but fails if there is =
not data in the text. So I want to check for the presence of data in =
the text box before I do the conversion. So I check for the length of =
the textbox value and perform the conversion if it contains text.=20
=09
    if (textbox.Text.Length !=3D0)=20
     cvDate =3D Convert.ToDateTime(textBox.Text);=20
    else=20
     I want to set cvDate to null. How do I do that? I get an error =
when I do=20
=09
     cvDate =3D null;=20
=09
    Thanks=20
    S=20
=09
    DateTime. It works | [aspngcs] member =
Click here to reveal e-mail address =3D YOUR ID | =
http://www.asplists.com/asplists/aspngcs.asp =3D JOIN/QUIT=20

jzri=01Djrj=20

Reply to this message...

Ryan Trudelle-Schwarz

One problem here is that date fields in a Database (such as SQL Server) =
can be null and that is a valid value for them, so there needs to be a =
logical way to mark the dates as null within the code to translate this =
to the database.=20

Personally, I usually create a struct that contains a date and a Boolean =
called "IsNull" and just check that value before using the date. Then =
check it when updating the db.

-> -----Original Message-----
-> From: Tim Musschoot [mailto:Click here to reveal e-mail address]
->=20
-> Whey convert it to NULL. This is not a valid timestamp...
->=20
-> I use this code:
->=20
-> DateTime cvDate;
-> try{
->     cvDate =3D DateTime.Parse(textbox.Text);
-> }
-> catch
-> {
->     cvDate =3D DateTime.Now;
-> }
->=20
-> This assurs you ALWAYS have a legal datetime value. You can use a
-> boolean to mark the usefullness of the date.... :
->=20
-> DateTime cvDate;
-> bool b_cvDate;
-> try{
->     cvDate =3D DateTime.Parse(textbox.Text);
->     b_cvDate =3D true;
-> }
-> catch
-> {
->     cvDate =3D DateTime.Now;
->     b_cvDate =3D false;
-> }
->=20
-> -----Oorspronkelijk bericht-----
-> Van: Brian W. Spolarich [mailto:Click here to reveal e-mail address]
->=20
-> This is sort of a problem in the .NET framework: how to represent =
an
-> uninitialized or null valued DateTime.
->=20
-> See
-> =
http://discuss.develop.com/archives/wa.exe?S2=3Ddotnet&L=3DDOTNET&q=3D&s=3D=
dateti
-> me+null&f=3D&a=3D&b=3D
->=20
-> for a discussion on this topic.
->=20
-> Regards,
->=20
-> -bws
->=20
->     -----Original Message-----
->     From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
->=20
->     Hi,
->=20
->     I'm using Convert.ToDateTime to convert a string representation of
-> a date in a TextBox. Here is what I'm doing:
->=20
->     DateTime cvDate;
->     cvDate =3D Convert.ToDateTime(textbox.Text);
->=20
->     This works fine if there is data in the text box, but fails if
-> there is not data in the text. So I want to check for the presence =
of
-> data in the text box before I do the conversion. So I check for the
-> length of the textbox value and perform the conversion if it contains
-> text.
->=20
->     if (textbox.Text.Length !=3D0)
->      cvDate =3D Convert.ToDateTime(textBox.Text);
->     else
->      I want to set cvDate to null. How do I do that? I get an
-> error when I do
->=20
->      cvDate =3D null;
->=20
->     Thanks
->     S

---
[This E-mail scanned for viruses by Declude Virus]

Reply to this message...

Brian Boyce

You can use System.DBNull or IsDbNull(object) to check for null values in
database fields, or indeed to pass a null value to a field through a
required stored procedure parameter.

Brian

-----Original Message-----
From: Ryan Trudelle-Schwarz [mailto:Click here to reveal e-mail address]
Sent: 07 July 2002 23:44
To: aspngcs
Subject: [aspngcs] RE: Convert.ToDateTime

One problem here is that date fields in a Database (such as SQL Server) can
be null and that is a valid value for them, so there needs to be a logical
way to mark the dates as null within the code to translate this to the
database.

Personally, I usually create a struct that contains a date and a Boolean
called "IsNull" and just check that value before using the date. Then check
it when updating the db.

-> -----Original Message-----
-> From: Tim Musschoot [mailto:Click here to reveal e-mail address]
->
-> Whey convert it to NULL. This is not a valid timestamp...
->
-> I use this code:
->
-> DateTime cvDate;
-> try{
->     cvDate = DateTime.Parse(textbox.Text);
-> }
-> catch
-> {
->     cvDate = DateTime.Now;
-> }
->
-> This assurs you ALWAYS have a legal datetime value. You can use a
-> boolean to mark the usefullness of the date.... :
->
-> DateTime cvDate;
-> bool b_cvDate;
-> try{
->     cvDate = DateTime.Parse(textbox.Text);
->     b_cvDate = true;
-> }
-> catch
-> {
->     cvDate = DateTime.Now;
->     b_cvDate = false;
-> }
->
-> -----Oorspronkelijk bericht-----
-> Van: Brian W. Spolarich [mailto:Click here to reveal e-mail address]
->
-> This is sort of a problem in the .NET framework: how to represent
-> an uninitialized or null valued DateTime.
->
-> See
-> http://discuss.develop.com/archives/wa.exe?S2=dotnet&L=DOTNET&q=&s=da
-> teti
-> me+null&f=&a=&b=
->
-> for a discussion on this topic.
->
-> Regards,
->
-> -bws
->
->     -----Original Message-----
->     From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
->
->     Hi,
->
->     I'm using Convert.ToDateTime to convert a string representation of a

-> date in a TextBox. Here is what I'm doing:
->
->     DateTime cvDate;
->     cvDate = Convert.ToDateTime(textbox.Text);
->
->     This works fine if there is data in the text box, but fails if there

-> is not data in the text. So I want to check for the presence of data
-> in the text box before I do the conversion. So I check for the
-> length of the textbox value and perform the conversion if it contains
-> text.
->
->     if (textbox.Text.Length !=0)
->      cvDate = Convert.ToDateTime(textBox.Text);
->     else
->      I want to set cvDate to null. How do I do that? I get an
-> error when I do
->
->      cvDate = null;
->
->     Thanks
->     S

---
[This E-mail scanned for viruses by Declude Virus]

| [aspngcs] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

Reply to this message...

Stephen Rees

Try using SqlDateTime type (... courtesy of the developer list)

Steve.
-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: 06 July 2002 23:51
To: aspngcs
Subject: [aspngcs] Convert.ToDateTime

Hi,

I'm using Convert.ToDateTime to convert a string representation of a date
in a TextBox. Here is what I'm doing:

DateTime cvDate;
cvDate = Convert.ToDateTime(textbox.Text);

This works fine if there is data in the text box, but fails if there is
not data in the text. So I want to check for the presence of data in the
text box before I do the conversion. So I check for the length of the
textbox value and perform the conversion if it contains text.

if (textbox.Text.Length !=0)
cvDate = Convert.ToDateTime(textBox.Text);
else
I want to set cvDate to null. How do I do that? I get an error
when I do

cvDate = null;

Thanks
S

DateTime. It works | [aspngcs] member Click here to reveal e-mail address = YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

Reply to this message...

SNegussie@aol.com

I'm having problems using SqlDateTime and DBNull. Here is what I'm doing:

SqlDateTime sdate;

if (textbx1.Text.Length !=0)
sdate = Convert.ToDateTime(textbx1.Text)
else
sdate = DBNull.Value;

I'm getting "Cannot implicity convert type System.DBNull to
System.Data.SqlTypes.SqlDateTime".

Here are my questions:
1) How can I set sdate to null using SqlDateTime types?
2) Is the statement in my if stmt correct? I'm assigning a SqlDateTime var
(sdate) the value of a txtbox after converting it using Convert.ToDateTime
which I think will result in System.DateTime value?

Thanks

Reply to this message...

SNegussie@aol.com

In a message dated 7/10/2002 12:28:23 PM Eastern Daylight Time,
Click here to reveal e-mail address writes:

[Original message clipped]

Any help on this?

Thanks
S

Reply to this message...

Ryan Trudelle-Schwarz

Try this:

if(textbx1.Text.Length != 0)
sdate = Convert.ToDateTime(textbx1.Text);
else
sdate = System.Data.SqlTypes.SqlDateTime.Null;

Note that it is using SqlDateTime's Null property to get a null value.

-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]

In a message dated 7/10/2002 12:28:23 PM Eastern Daylight Time,
Click here to reveal e-mail address writes:

I'm having problems using SqlDateTime and DBNull. Here is what I'm
doing:

SqlDateTime sdate;

if (textbx1.Text.Length !=0)
sdate = Convert.ToDateTime(textbx1.Text)
else
sdate = DBNull.Value;

I'm getting "Cannot implicity convert type System.DBNull to
System.Data.SqlTypes.SqlDateTime".

Here are my questions:
1) How can I set sdate to null using SqlDateTime types?
2) Is the statement in my if stmt correct? I'm assigning a SqlDateTime
var (sdate) the value of a txtbox after converting it using
Convert.ToDateTime which I think will result in System.DateTime value?

Any help on this?

Thanks
S

---
[This E-mail scanned for viruses by Declude Virus]

Reply to this message...

Werner Schram

This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.

--------------InterScan_NT_MIME_Boundary
Content-Type: multipart/alternative;
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------_=_NextPart_001_01C22974.17EBF500
Content-Type: text/plain

Hi,

SqlDateTime has a lot of constants and conversions:

1) sdate=SqlDateTime.Null
2) Yes, this statement is correct; SqlDateTime has an overloaded
conversion operator for both SqlDateTime to DateTime and DateTime to
SqlDateTime.

I hope this helps.

Werner.

-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: donderdag 11 juli 2002 13:55
To: aspngcs
Subject: [aspngcs] RE: Convert.ToDateTime

In a message dated 7/10/2002 12:28:23 PM Eastern Daylight Time,
Click here to reveal e-mail address writes:

I'm having problems using SqlDateTime and DBNull. Here is what I'm doing:

SqlDateTime sdate;

if (textbx1.Text.Length !=0)
sdate = Convert.ToDateTime(textbx1.Text)
else
sdate = DBNull.Value;

I'm getting "Cannot implicity convert type System.DBNull to
System.Data.SqlTypes.SqlDateTime".

Here are my questions:
1) How can I set sdate to null using SqlDateTime types?
2) Is the statement in my if stmt correct? I'm assigning a SqlDateTime var
(sdate) the value of a txtbox after converting it using Convert.ToDateTime
which I think will result in System.DateTime value?

Any help on this?

Thanks
S | [aspngcs] member Click here to reveal e-mail address = YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp = JOIN/QUIT

------_=_NextPart_001_01C22974.17EBF500
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Content-Transfer-Encoding: quoted-printable

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xmlns=3D"http://www.w3.org/TR/REC-html40";>

<head>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">

<meta name=3DProgId content=3DWord.Document>
<meta name=3DGenerator content=3D"Microsoft Word 10">
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<style>

</style>

</head>

<body lang=3DEN-US link=3Dblue vlink=3Dpurple =
style=3D'tab-interval:36.0pt'>

<div class=3DSection1>

Hi,<o:p></o:p>

<o:p> </o:p>=

SqlDateTime</spa=
n> has a lot of constants and =
conversions:<o:p></o:p>

<o:p> </o:p>=

<![if !supportLists]>1) =
<![endif]>sdate=3DSqlDateTime.Null<o:p></o:p>

<![if !supportLists]>2) =
<![endif]>Yes, this statement is correct; SqlDateTime
has an overloaded conversion operator for both SqlDateTime
to DateTime and DateTime to
SqlDateTime.<o:p></o:p>

<o:p> </o:p>=

I hope this =
helps.<o:p></o:p>

<o:p> </o:p>=

Werner.<o:p></o:p></p=
>

<o:p> </o:p>=

-----Original =
Message----- 
From: Click here to reveal e-mail address
[mailto:Click here to reveal e-mail address] 
Sent: donderdag 11 juli =
2002 13:55 
To: aspngcs 
Subject: [aspngcs] RE:
Convert.ToDateTime

<o:p> </o:p>

In a message dated =
7/10/2002
12:28:23 PM Eastern Daylight Time, Click here to reveal e-mail address writes: 
 
 
<![if !supportLineBreakNewLine]> 
<![endif]><o:p></o:p>

I'm having problems using
SqlDateTime and DBNull. Here is what I'm doing: 
 
SqlDateTime sdate; 
 
if (textbx1.Text.Length !=3D0) 
 sdate =3D =
Convert.ToDateTime(textbx1.Text) 
else 
 sdate =3D DBNull.Value; 
 
I'm getting "Cannot implicity convert type System.DBNull to
System.Data.SqlTypes.SqlDateTime". 
 
Here are my questions: 
1) How can I set sdate to null using SqlDateTime types? 
2) Is the statement in my if stmt correct? I'm assigning a =
SqlDateTime
var (sdate) the value of a txtbox after converting it using =
Convert.ToDateTime
which I think will result in System.DateTime value? =
<o:p></o:p>

 
 
Any help on this? 
 
Thanks 
S | =
[aspngcs]
member Click here to reveal e-mail address =3D YOUR ID |
http://www.asplists.com/asplists/aspngcs.asp =3D JOIN/QUIT =
<o:p></o:p>

</div>

</body>

</html>

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Reply to this message...

Ariff Damji

According to: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemconvertclasstodatetimetopic13.asp

Convert.ToDateTime(string) will take a null string and convert it to DateTime.MinValue. Seems like this is the way to go...

Ariff

--------------------------------
From: Ariff Damji

Reply to this message...

	System.Convert
	System.Data.SqlTypes.SqlDateTime
	System.DateTime
	System.DBNull
	System.Web.UI.MobileControls.TextBox
	System.Web.UI.WebControls.TextBox
	System.Windows.Forms.TextBox

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