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by: JackO |
last post by:
I have a text box on a form “txtExamDate” that I know contains nothing. I am
trying to test code that will determine the text box is nothing. I am
getting the error because there is no value in the field and I am assigning
it to a date field. My question is: How do I get the If statement to work?
Exception Details: System.FormatException: String was not recognized as a
valid DateTime
Line 723: If TypeOf...
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by: Rhino |
last post by:
I am working with SQL Functions in DB2 for Windows/Linux/UNIX (V8.2.1) and
am having a problem setting input parameters for SQL Functions to null in
the Development Center.
My simple function, called Half, has a single integer input parameter and
divides this value by two to produce its result. It also tests the input
parameter to see if it is null; if it is null, it returns null. When I click
the Run button and try to use the SET TO...
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by: PST |
last post by:
Here's a problem I'm trying to deal with:
I'm working on a Frontpage 2000 website for a boat handicapping
system, built in Access 97.
What I'm trying to accomplish is:
The user enters a boat name in a text field OR a sail number in a text
field, and gets the desired boat record back (an exact match).
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by: Rich |
last post by:
I have a access form that is connected to linked sql table via odbc.
I have some fields that I dont want to allow nulls when data is
entered via the form. I can set the null checking on the SQL server
database but the ODBC error tha tis returned is not very polite to the
user since it mentions the sql field not the nice label.
Is there a way for me to modify this error or put the check in access?
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by: Chris |
last post by:
Hi,
I have an SQL Query that loads a SQLDataReader object.
The returned record has bit datatype columns that I use to provide
true/false values.
I can't get a definite answer googling on how to test if this field is null.
I get casting errors, and can't check for null on a null data value errors
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by: Andy G |
last post by:
I'm getting this error...Operator is not valid for type 'DBNull' and string
"". What is happening is that I'm calling a stored procedure to use the
email address to recover a forgotten username. If the email does not exist
then I get the above error. After I execute the stored procedure I try and
apparenty this is not catching the error. Should I use a Try...Catch? What
is the correct way to check for nulls in ASP.NET?
If Not...
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by: Brett Romero |
last post by:
What is a better way for checking nulls than using the "==" operator?
For example, .Equals() is better than == for most operations since it
knows the type being checked. However, it doesn't seem to work for
nulls. For example:
object myobject = new object();
myobject = null;
if (myobject.Equals(null))
Debug.WriteLine("no go");
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by: Johan Tibell |
last post by:
I've written a piece of code that uses sockets a lot (I know that
sockets aren't portable C, this is not a question about sockets per
se). Much of my code ended up looking like this:
if (function(socket, args) == -1) {
perror("function");
exit(EXIT_FAILURE);
}
I feel that the ifs destroy the readability of my code. Would it be
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by: oaklander |
last post by:
I currently have two String variables I check to find if they are duplicates:
String str1 = "red";
String str2 = "yellow";
if (str1.equals(str2)){
System.out.println("Duplicate");
}
else{
System.out.println("Not duplicate");
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by: ricardovillarroel |
last post by:
i am trying to check the text box for nulls once the user tabs over the text box. i do not want it to check for nulls when i click on okay. here is code. do i need to setfocus so it will go back to the text box?
Private Sub txtArrivalDate_AfterUpdate()
Dim ArrivalDate As Date
ArrivalDate = txtArrivalDate.Value
If IsNull(ArrivalDate) Then MsgBox ("Please enter a valid date.")
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, well explore What is ONU, What Is Router, ONU & Routers main usage, and What is the difference between ONU and Router. Lets take a closer look !
Part I. Meaning of...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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