C# Discussion Boards - CodeProject

Check for empty DateTimeInput in c#

30-Mar-12 8:02

Ramkithepower wrote:
Is there any such tool?

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nhanlaptrinh29-Mar-12 20:01

nhanlaptrinh

29-Mar-12 20:01

I have a control DateTimeInput, when I run up, then assign the current date by default, but when his days in DateTimeInput clrear then how do you know to enter the date again? I checked the way DateTimeInput.Text == "" or DateTimeInput.Value.ToString () == "" but it does not understand. Thanks to all who know you helped with.

Re: Check for empty DateTimeInput in c#

kiran605329-Mar-12 20:10

kiran6053

29-Mar-12 20:10

i can give two ways

1--->u can use directly system date time

2---->if u use any control for date and time see the database table variable ...if it is given as date then check the properties of u r control with code....

I hope it will help u????????///

Re: Check for empty DateTimeInput in c#

OriginalGriff29-Mar-12 22:39

OriginalGriff

29-Mar-12 22:39

What kind of control is it?

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

Re: Check for empty DateTimeInput in c#

nhanlaptrinh30-Mar-12 1:25

nhanlaptrinh

30-Mar-12 1:25

datetimeinput of dotnetbar.

multithreading control and management

nasser_ali29-Mar-12 11:06

nasser_ali

29-Mar-12 11:06

every one please help me
i can n't write program to control and management multithreading
and transfer variables between threads

Re: multithreading control and management

Ravi Bhavnani29-Mar-12 11:11

Ravi Bhavnani

29-Mar-12 11:11

Do you have a specific question or problem? That would assist us in trying to help you.

/ravi

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making parllel for loop with uses of all processor

KUNWAR99929-Mar-12 8:52

Re: making parllel for loop with uses of all processor

29-Mar-12 8:52

here is my code, word is a string array. i want to convert this code into parllel ,so that i can reduce time and use all processor of my i5 processor system..

for (int i = 0; i < k1; i++)
{
for (int j = 0; j < k1; j++)
{
num[j][i] = Convert.ToInt32(words[count]);
count++;
}
}

can anyone help me out in this????

Eddy Vluggen29-Mar-12 9:05

Re: making parllel for loop with uses of all processor

29-Mar-12 9:05

Easiest solution is to convert it to a parallel loop[^], available in .NET 4;

using System;
using System.Threading.Tasks;

class Demo
{
    int N = 1000;

    void TestMethod()
    {
        Parallel.For(0, N, (i, loopState) =>
        {
            Console.WriteLine(i);
            if (i == 100)
            {
                loopState.Break();
            }
        });
    }
}

If you need more control, you'd typically use a thread[^].

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KUNWAR99930-Mar-12 7:13

Re: making parllel for loop with uses of all processor

30-Mar-12 7:13

I tried this code.. but i m getting high execution time than its sequential code.. and parllel execution should take less execution time than sequential code.. Frown | :(

Eddy Vluggen30-Mar-12 8:02

Re: making parllel for loop with uses of all processor

30-Mar-12 8:02

KUNWAR999 wrote:
and parllel execution should take less execution time than sequential code..

..if the problem can be solved using parallel threads, and only when implemented correctly. The example was the easiest method, but it's only a shorthand for a specific type of problem.

You can spawn threads[^] to run code concurrently. It's usually the OS that decides on which core the thread runs, but I believe you can set it's affinity.

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KUNWAR99930-Mar-12 8:14

Re: making parllel for loop with uses of all processor

30-Mar-12 8:14

i hv tried it one more way as using #pragma omp parllel ..
but vs2010 saying that its unrecognized concept..
actually i am avoiding using threads because i want to use parllel processing in processor directly.. Frown | :(

Eddy Vluggen30-Mar-12 8:26

30-Mar-12 8:26

KUNWAR999 wrote:
actually i am avoiding using threads because i want to use parllel processing in processor directly..

..and how would you do that?

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Using Reflections

SFORavi29-Mar-12 8:21

SFORavi

29-Mar-12 8:21

Can you please explain or give a link to understand basic concept of Reflections in c#.

Thanks, Ravi

http://msdn.microsoft.com/en-us/library/gg145033.aspx[^]

PIEBALDconsult29-Mar-12 8:41

PIEBALDconsult

29-Mar-12 8:41

Ravi Bhavnani29-Mar-12 11:13

Ravi Bhavnani

29-Mar-12 11:13

See this[^] tutorial.

/ravi

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Home | Articles | My .NET bits | Freeware
ravib(at)ravib(dot)com

RobCroll29-Mar-12 16:56

RobCroll

29-Mar-12 16:56

Reflection allows you to look at compiled .NET classes and assemblies and discover their classes and members (fields, properties, methods and events). Once discovered you can interact with these members, such as assigning values to properties etc.

It is unusual to use reflection in everyday programming. However if you were creating developer tools you may see a use for reflection.

Some classic examples where reflection is used include unit testing, documentation creation and code validation.

Reflection can also discover attributes. If you're familiar with XmlSerialization, reflection is used to read the attributes to determine which fields to serialize and which to ignore.

Others have given links for more information.

"You get that on the big jobs."

CDP180229-Mar-12 23:06

CDP1802

29-Mar-12 23:06

RobCroll wrote:
It is unusual to use reflection in everyday programming

Really? Reflection is generally not known to be fast, but it can be of enormous help in many situations if used sparingly. These are my most recent examples:

I am working on my own UI and there are style objects which follow the class hierarchy of the controls. When loading a control the closest related style is found with reflection and applied to the control, even if it's a custom control with no custom style class. In that case the style of the control's baseclass is found and applied.

Also, a kind of class finder is used to decouble modules and assemblies to find specific classes and create instances of them. It uses reflection to search through the assemblies for the requested type. Let's say I'm looking for ILoginPresenter and ILoginView in order to open the application's login screen. Obtaining instances of those two would not require tightly coupled assemblies or classes. The only dependencies would be the interfaces involved.

I'm invincible, I can't be vinced

Abhinav S29-Mar-12 19:25

Abhinav S

29-Mar-12 19:25

A chapter from this book[^] should surely help you get started.

label problem

KUNWAR99929-Mar-12 6:57

29-Mar-12 6:57

hey guys,.. i am doing my mini project in c# windows form application .. in that i used a label l in form.when
l.Text= "&";
its not showing anything on form inplace of label.
Can anyone knows solution for it??

modified 29-Mar-12 13:17pm.

fjdiewornncalwe29-Mar-12 7:02

fjdiewornncalwe

29-Mar-12 7:02

You can try a couple of things.
(Note: I haven't tried them to make sure they all work. I just thought I'd throw out the ideas for you.)

a.Text = @"&";
a.Text = "\&";
a.Text = "& # 3 8;"; // Don't put the spaces between the characters. I just did that because otherwise you would just see the & and not the &# 38;";
a.Text = &

I wasn't, now I am, then I won't be anymore.

KUNWAR99929-Mar-12 7:20

29-Mar-12 7:20

sorry, my fault.. actually i have asked wrong question.. i have updated my question.. can u pls answer for it.. ??
thank u

Matt U.29-Mar-12 7:14

Matt U.

29-Mar-12 7:14

Strange. I copy/pasted your code bit. And MessageBox displays the '&'. What version of Windows, maybe?

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Pete O'Hanlon: He has my permission to run it.

KUNWAR99929-Mar-12 7:19