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Well,
I do know that difference as e.Node.Parent.IsSelected would only go up until it reached the parent of the child node, which could several levels deep, while e.Node.Level == 0 would got to the actual root node at level 0. But in a treeview with a parent at level 0 , and a child at level 1 , should just work.
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Hi Rick
if (e.Node.Parent.IsSelected)
{
MessageBox.Show("This is the parent node");
}
This piece of code doesn't make sense in the context of an AfterSelect handler. By definition e.Node is selected therefore it's parent, e.Node.Parent, is not and e.Node.Parent.Selected will always be false.
AlanN
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Hi,
I'm quite new to c# and OOP in general.
I have a situation where I am parsing an xml file and creating objects based on what I find there. What I want to do is name any object or struct I create using the name attribute from my element. I have assigned the current name attribute to a string variable. How do I know use that to name my object to the value of that string?
Thanks for any help.
Neil
tsd
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You can't do that, and even if you could, how would you use a variable that you don't know exists?
Use a collection to store your objects, like:
Dictionary<string, MyClass> items = new Dictionary<string, MyClass>();
items.Add(name, new MyClass(something));
MyClass item = items[name];
Experience is the sum of all the mistakes you have done.
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Here is a simple question for you C# Gods. How do you pass arrays -- specifically, an array of integers of unknown length -- as arguments to methods in C#?
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Xarzu wrote: How do you pass arrays -- specifically, an array of integers of unknown length -- as arguments to methods in C#?
Use the params keyword.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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Why can't you just pass an int[] ? Personally, I'd use a List<int>
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Just do something like
void MyFunction(int[] myarray)
{ }
and call it like this
int[] arr = {2,4,6};
MyFunction(arr);
You can also use the params keyword which allow you to pass the elements as parameter as well as the former way.
Let's say something like
void MyFunction(params int[] myarray)
{ }
call it either
int[] arr = {2,4,6};
MyFunction(arr);
or
MyFunction(2,4,6);
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An array is just an ordinary object. Just pass the reference:
int[] someArray = new int[] { 1, 2, 3 };
someMethod(someArray);
public void someMethod(int[] arrayArgument) {
Console.WriteLine(arrayArgument.Length.ToString());
}
Experience is the sum of all the mistakes you have done.
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Hi Guy
last two replay are cleared your question.
that's correct way.
Thanks
Cheers
RRave
MCTS,MCPD
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I have the following code:
if ( (m_myThread.ThreadState & System.Threading.ThreadState.Running) == 0)
{
DoSomething();
}
else
{
DoSomethingElse();
}
The code above results in the compiler claiming that the code in the else block is unreachable. if I change the if line to this:
if ( m_myThread.ThreadState & System.Threading.ThreadState.Running == 0)
I get the following compiler *error*:
Operator '&' cannot be applied to operands of type 'System.Threading.ThreadState' and 'bool'
What's going on (in both cases)?
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
modified on Friday, February 8, 2008 5:16 AM
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John Simmons / outlaw programmer wrote: What's going on (in both cases)?
Operator Precedence
led mike
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The code you're using is straight out of MSDN, so I don't see why it shouldn't work. What if you break it down and use the debugger to see what the result is ? I mean, what if you & the two values into a variable first, then check it's value ? That way you can have a look at what is going on.
I'd also try swapping it around to this:
if ( (m_myThread.ThreadState & System.Threading.ThreadState.Running) == System.Threading.ThreadState.Running)
and then swap the two method calls, obviously.
John Simmons / outlaw programmer wrote: I get the following compiler *error*:
In the second case it's an order of operations error, the == has precedence, so it works out to
if ( m_myThread.ThreadState & (System.Threading.ThreadState.Running == 0))
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Actually, according to MSDN, Running is 0, so if you want to check for ThreadState.Running, you have to do it like this:
if ((myThread.ThreadState & (System.Threading.ThreadState.Stopped | System.Threading.ThreadState.Unstarted)) != 0)
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
modified on Friday, February 8, 2008 5:16 AM
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OK - the idea of a bit mask with a 0 value is so retarded, it didn't even occur to me 
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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That was my thought too when I found the answer.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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The value for System.Threading.ThreadState.Running is 0. 0 & anything is zero. Zero always causing a PITA when doing bitwise comparisons causing a special case. In fact, I do not think you can bitwise a 0. In the set of all real numbers the | on 0 will always return a result. Notice in the documentation on the MSDN, however, that running is a exclusivespecial case that is not bitwiseable with any other case.
The proper code would be
if(myThread.ThreadState == System.Threading.ThreadState.Running){
}
else if(myThread.ThreadState & System.Threading.ThreadState.AnyOtherState == AnyOtherState){
}
Need a C# Consultant? I'm available.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
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Hi,
I havn't dealt much with floating numbers / calculation since recently.
Let me explain my issue:
I have the following 3 values declared:
float overallTotalAmps = 0;<br />
int voltage = 230;<br />
int overTotalWatt = 126;
on which I do the following calcluation:
overallTotalAmps = float.Parse((overallTotalWatt / voltage).ToString());
The value of overallTotalAmps always returns 0.00 which should be 0.55 (126 / 230).
Am I using the incorect data type here or perhaps if someone could just point out to me what it is I'm doing wrong here? 
Thanks.
R
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You need to cast your int values to float values before you divide them.
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float overallTotalAmps = 0;
int voltage = 230;
int overTotalWatt = 126;
overallTotalAmps = (float)overTotalWatt / (float)voltage;
led mike
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Great stuff!!
Thanks to both of you that replied.
It works perfectly!!! 
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Hi,
adding to the other replies:
many problem domains are continuous by nature; if so, you should not use integers at all.
The simplest approach is to make overallTotalAmps , voltage, overTotalWatt, ... all float or double.
That way you don't have to cast, and won't have any rounding errors that may go unnoticed.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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I know you've already got an answer, but I was a bit baffled by the use of ToString and float.parse so I thought I'd give you a rundown of what that actually does
overallTotalWatt / voltage
=> (int)126 / (int)230
=> 0 (since we're dividing ints)
0.ToString() => "0"
float.Parse("0") => 0.00
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Anyone that ToString's a number to parse should be dragged outside and shot.
Need a C# Consultant? I'm available.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
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Hi Guys. I am having problems with writing data to an Access DB. I keep getting error message "Syntax error in INSERT INTO statement". This is when I try and add a new row to the data table. See below code. The section where it stops is highlighted below.
I'm stumped. Have tried a number of things and nothing works.
 
public partial class logon : Form
{
OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\database.mdb");
OleDbDataAdapter m_daDataAdapter;
DataTable m_dtPassword = new DataTable();
public logon()
{
InitializeComponent();
}
private void btnCreateUser_Click(object sender, EventArgs e)
{
conn.Open();
m_daDataAdapter =
new OleDbDataAdapter("Select * From [Callcentre]", conn);
OleDbCommandBuilder m_cbCommandbuilder =
new OleDbCommandBuilder(m_daDataAdapter);
m_daDataAdapter.Fill(m_dtPassword);
DataRow drNewRow = m_dtPassword.NewRow();
drNewRow["UserName"] = txtboxUserName.Text;
drNewRow["Password"] = cipherText;
m_dtPassword.Rows.Add(drNewRow);
<code>m_daDataAdapter.Update(m_dtPassword);</code>
m_rowPosition = m_dtPassword.Rows.Count - 1;
}
}
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