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Thank you, I hadn't thought of using .ToArray() on a List. Forgot I could, honestly. I'll give it a try and, if it works, I'll mark this as solved.
Edit: Worked perfectly! Thank you very much!
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Dave K. has answered your question, but I think you might get some benefit from a fantastic article by Keith Barrow (revised Aug. 30, 2013), "Await Tasks in C#4 using Iterators," about creating the functionality of C#5.0's await/async functionality for people using C#4.0.
It's one of the best written articles I have ever seen on CodeProject, and it contains a wealth of information that will give you "deep background" on threads, and asynchronous events [^].
good luck, Bill
Google CEO, Erich Schmidt: "I keep asking for a product called Serendipity. This product would have access to everything ever written or recorded, know everything the user ever worked on and saved to his or her personal hard drive, and know a whole lot about the user's tastes, friends and predilections." 2004, USA Today interview
modified 2-Sep-13 5:06am.
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Thanks, I'll check it out.
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BillWoodruff wrote:
article by Keith Barrow (revised Aug. 30, 2013), "Await Tasks in C#4 using Iterators,"
Thanks for the very kind words  and article "plug" (promotion), my friend! The author is a different "Keith", though. ![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Hi all,
i am using code to disable a task in windows task scheduler.
here is my code
TaskService ts = new TaskService(@"\\" + domain + "", "" + user + "", "" + domain + "", "" + passwo + "", true);
ts = new TaskService();
Task t = ts.GetTask(Task);
if (t != null)
{
try
{
if (t.Enabled)
{
t.Enabled = false;
t.RegisterChanges();
}
}
finally
{
if (ts.Connected)
{
t.Stop();
ts.EndInit();
}
}
}
it is working fine but in the same application some more function is there when other function is running in between i am getting this error "safe handle has been closed".
i copied the stack trace and pasting here below:
" at System.Security.Principal.Win32.ImpersonateLoggedOnUser(SafeTokenHandle hToken)\r\n at System.Security.Principal.WindowsIdentity.SafeImpersonate(SafeTokenHandle userToken, WindowsIdentity wi, StackCrawlMark& stackMark)\r\n at System.Security.Principal.WindowsIdentity.Impersonate(StackCrawlMark& stackMark)\r\n at System.Security.SecurityContext.SetSecurityContext(SecurityContext sc, SecurityContext prevSecurityContext, StackCrawlMark& stackMark)\r\n at System.Threading.ExecutionContext.SetExecutionContext(ExecutionContext executionContext)\r\n at System.Threading.ExecutionContext.runTryCode(Object userData)\r\n at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)\r\n at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n at System.Threading._TimerCallback.PerformTimerCallback(Object state)"
please solve this problem it is irritating me too much.
Thanks,
Hello Everybody
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So you've posted some code which does work, and an error message from some other code which doesn't work, but you haven't posted the code which doesn't work? 
We can't read your mind or your screen; we're not the NSA. You'll need to post the code which is throwing the error before anyone can help you.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hi sir,
that error suddenly coming even it is not tracing by try catch block.
i pasted stack trace with my question. accept that i didn't get any specific line in which that error is coming but one thing if i am not using that code my application is working fine.
Thanks,
Hello Everybody
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private void Form1_Load(object sender, EventArgs e)
{
readThread = new Thread(new ThreadStart(Read));
port = new SerialPort();
port.BaudRate = 921600;
port.PortName = "COM16";
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.ReadTimeout = 30000;
port.WriteTimeout = 30000;
port.DtrEnable = true;
port.RtsEnable = true;
port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
port.Open();
}
private void buttonSend_Click(object sender, EventArgs e)
{
port.Write("AT+CUSD=1,\"*140*1#\",15" + System.Environment.NewLine);
}
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
SerialPort spL = (SerialPort)sender;
byte[] buf = new byte[spL.BytesToRead];
spL.Read(buf, 0, buf.Length);
foreach (Byte b in buf)
{
message += b.ToString();
}
textBoxSMS.BeginInvoke((MethodInvoker)delegate()
{
textBoxSMS.Text += Encoding.ASCII.GetString(buf);
});
}
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Wrong thread.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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i have tired to search how to send USSD command on google.
i want to chek may balance from operator.
in every samples that i saw every body used commands like this:
"AT+CUSD=1,\"*140*1#\"\r\n";
it seams Tobe correct and i use somethings like this and i think it works.
i have a d-link gsm modem and when i send this command by it it make some noise on my speaker
from this i can find some thinks is happend 
my modem have it's own windows application when i disconnected modem by my own application,i check it by modem's application and in USSD tab i can found the result of my commands that i sent by myself application.
then that command works fine but i 'm confuse what is happens when i sent my command it return me "OK" and do not return operator answer and how my modem's application can read that answer????????
i test these commands but can not get result and my modem just return somethings like this:
"AT+CUSD=1,\"*140*1#\"\r\n\OK\r\n" only.
1) "AT+CUSD=1,\"*140*1#\",15\r\n"
2) "AT+CUSD=1,\"*140*1#\",1\r\n"
3) "AT+CUSD=1,\"*140*1#\",15\r"
4) "AT+CUSD=1,\"*140*1#\",1\r"
5) "AT+CUSD=1,\"*140*1#\""
i think reading command's result maybe has difference command or i should set some config on my modem .
it is very interesting for me that my modem do not return error to me and always return OK.
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You should read the documentation for your modem.
Veni, vidi, abiit domum
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what you thinking , if i had it i come here and make a post!!!!!!!!!!!!!!!!!1
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OK, then you go to the vendor and get it!
What do you think WE would do in your situation?!
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i think you do not know any things about this,for this DO NOT MAKE DISTRIBUTION
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davidstein wrote: i think you do not know any things about this,
We still know that the answer to this question is in the documentation for the modem. Not that you have really explained what you are trying to get out of it.
Veni, vidi, abiit domum
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You're an idiot.
What you asked is so rarely ever done that the only place you're going to find your answer is the people who made the modem you're using!
To get information, you go to the most likely source you're going to find it and that's the manufacturer of the device you're got a question about. What's so hard about understanding that??
Have a nice life.
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that is none of your business what am i doing here,is that hard to understanding???
have a nice brain in your head
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If nobody here has ever done what you're doing, do you really expect an answer?
Considering I make a 6 figure income doing this stuff, yes, yes I do have a nice brain in my head.
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i wants to calculate salary percentage plz send ne code
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Seriously?
Value = (Salary / 100) * percentage;
I'll let you determine the types required
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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private void btnDelete_Click(object sender, EventArgs e)
{
int id = Convert.ToInt32(txtId.Text);
string name = txtName.Text;
decimal sal = Convert.ToDecimal(txtSal.Text);
cmd.CommandText = "Delete from Emp where EmpId = " + id;
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
private void btnCalc_Click(object sender, EventArgs e)
{
int Result;
int Total;
int sal = int.Parse(txtper.Text);
Value = (Salary / 100) * percentage;
}
like this i wrote still it is getting error
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Value = (Salary / 100) * percentage;
Value would the the variable that you want to store the result in
Salary would be the variable / object that stores the salary value
percentage would be the variable / object that stores the percentage that you want to do the multiplication by.
The answer I gave you was a formula to find out the what a percentage of X would be.
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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iam still getting error plz send me complete code
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ashwini dharamsale wrote: iam still getting error
Out of the 46,298 errors that you could be getting you seriously expect us to guess with is the one error that you are getting? Do you realize that it's Friday and most of us have used up all of our mind reading credits for the week.
ashwini dharamsale wrote: send me complete code
What? No mention of how much you are going to pay us to do your work for you? Or, how you intend to pay?
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Out of memory...... Good luck!
Best error ever!
=)
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