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by: MP |
last post by:
Hello,
I am trying to write a class that will expose some properties. One of the
property is extracted from a SQL database and can be NULL or some integer
value.
Is there a elegant way of implementing this in C# ? I do not want to use
variant (or similar types) because I want to retain a strnong types
property. Will I have no choices but to add another property that would
set/get the NULL value?
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by: Marc van den Bogaard |
last post by:
hello together,
my datarow.item property is missing, i just can accesss the ItemArray
property,
what is wrong with this?
System.Data.DataSet dataset1 = new System.Data.DataSet();
System.Data.DataTable datatable1 = new System.Data.DataTable("table1");
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by: Raymond Lewallen |
last post by:
Which would be the proper way or the reason for using any of the following
or combinations of the following? These are the 3 ways I've figured I can
do what I want to do, I just don't know which would be best:
#1
' Everything is create upon instantiation. Once completed, datatable can be
obtained from the property.
Public Class A
Private dt as DataTable
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by: David Webster |
last post by:
I have the following bit of code (which works fine):
Dim Customer As New CCustomer
mFrmOrder.lstCustID.DataSource =
Customer.getCustomers.Tables("data")
mFrmOrder.lstCustID.DisplayMember = "surname"
mFrmOrder.lstCustID.ValueMember = "custID"
mFrmOrder.lstCustID.Refresh()
mFrmOrder.lstCustID.ClearSelected()
Customer = Nothing
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by: Aaron Smith |
last post by:
Ok. I have a dataset that has multiple tables in it. In one of the child
tables, I have a column that I added to the DataSet (Not in the
DataSource). This column does not need to be stored in the data on the
datasource. It simply gets the first name and last name of an instructor
and displays it in the grid. I have two major problems.... One, it
doesn't display in the column until the row is saved, (Even after
calling a refresh on the...
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by: bordsby |
last post by:
Situation:
I am using an OleDbDataAdapter to fill a DataSet's DataTable with data
from an Access database. The DataSet's DataTable is bound to a
DataGrid. After the OleDbDataAdapter.Fill method is called, the
DataGrid displays the column headings as the column names output from
the Access SQL query. I would like to change some of the styles for
certain columns in the DataGrid, so I first need to set the
DataGridColumnStyle.MappingName...
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by: Job Lot |
last post by:
My DataGridView control is bound to a DataTable. Columns and rows are added
dynamically to the DataTable at run tine. I am setting Caption property of
DataColumn to show descriptive names of the columns, but the Caption is not
shown in the DataGridView control, it shows the ColumnName instead. Why?
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by: AndyB |
last post by:
I'm using xsd.exe to generate a typed-dataset. Then using typed dataset
tables (datatables containing two columns--a name and a value) to bind to
ASP.NET dropdown list controls (for the dropdown list option values).
All was fine with the binding, until I moved the dataset to a different
assembly, as I found out that the DataColumn property is "Friend" (in
VB.NET).
Could you point me how to make the DataColumn "public", or another work...
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by: DaveP |
last post by:
im Trying to set a Datacolumn type for a new table
boolean is not working, What is the correct waty
//column.DataType = System.Type.GetType"System.Data.SqlTypes.SqlBoolean");
column.DataType = System.Type.GetType"System.Boolean"); //"System.Boolean");
tia
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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, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s 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: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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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: 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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