The resolution of [`DateTime.Now`][1] depends on your system timer (~10ms on a current Windows OS)...so it&#39;s giving the same ending value there (it doesn&#39;t count any more finite than that).


  [1]: http://msdn.microsoft.com/en-us/library/system.datetime.now.aspx

Not really an answer to your question as asked, but thought I&#39;d chip in about your general objective. 

There already is a method to generate random file names in .NET.

See [System.Path.GetTempFileName][1] and [GetRandomFileName][2].

Alternatively, it is a common practice to use a GUID to name random files.


  [1]: http://msdn.microsoft.com/en-us/library/system.io.path.gettempfilename.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.io.path.getrandomfilename.aspx

You can get the milliseconds since 1/1/1970 using such code:

    private static DateTime JanFirst1970 = new DateTime(1970, 1, 1);
    public static long getTime()
    {
    	return (long)((DateTime.Now.ToUniversalTime() - JanFirst1970).TotalMilliseconds + 0.5);
    }

to convert the current datetime to file name to save files you can use 

    DateTime.Now.ToFileTime();

this should resolve your objective

I had a similar problem.

I would also look at this answer: [Is there a high resolution (microsecond, nanosecond) DateTime object available for the CLR?](https://stackoverflow.com/questions/5358860/is-there-a-high-resolution-microsecond-nanosecond-datetime-object-available-f).

About half-way down is [an answer][1] by &quot;Robert P&quot; with some extension functions I found useful.


  [1]: https://stackoverflow.com/a/5359304/

Is there any way to trigger event (may be custom) on attribute change? 

Let&#39;s say, when IMG src is changed or DIV&#39;s innerHtml? 

Firing event on DOM attribute change

I have a search screen which can be launched from clicking on a &quot;name&quot; field of another screen.

If the user follows this workflow, I add an extra to the Intent&#39;s Extras called &quot;search&quot;. This extra uses the text populating the &quot;name&quot; field as its value.  When the search screen is created, that extra is used as a search parameter and a search is automatically launched for the user.

However, since Android destroys and recreates Activitys when the screen rotates, rotating the phone causes an auto-search again.  Because of this, I&#39;d like to remove the &quot;search&quot; extra from the Activity&#39;s Intent when the initial search is executed.

I&#39;ve tried doing this like so:

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
        	if (extras.containsKey(&quot;search&quot;)) {
        		mFilter.setText(extras.getString(&quot;search&quot;));
        		launchSearchThread(true);
        		extras.remove(&quot;search&quot;);
        	}
        }

However, this isn&#39;t working.  If I rotate the screen again, the &quot;search&quot; extra still exists in the Activity&#39;s Intent&#39;s Extras.

Any ideas?


Removing extras from passed-in Intent

In my application I generate files at random opportunities. To ensure a unique naming, I tried to use the nano seconds since 1.1.1970:

    long time = DateTime.Now.Ticks;
    String fileName = Convert.ToString(time);
    Console.WriteLine(fileName);

Now I observed something weird. Why is the output like that? I mean why are the last 4 numbers always the same? I can use this as a filename, that is not the problem, but I&#39;m just wondering about it.

    634292263478068039
    634292263512888039
    634292263541368039
    634292263603448039
    634292263680078039

How does DateTime.Now.Ticks exactly work?

In my application I generate files at random opportunities. To ensure a unique naming, I tried to use the nano seconds since 1.1.1970:
<pre><code class="hljs language-ini">long time = DateTime.Now.Ticks;
String fileName = Convert.ToString(time);
Console.WriteLine(fileName);
</code></pre>
Now I observed something weird. Why is the output like that? I mean why are the last 4 numbers always the same? I can use this as a filename, that is not the problem, but I'm just wondering about it.
<pre><code class="hljs">634292263478068039
634292263512888039
634292263541368039
634292263603448039
634292263680078039
</code></pre>

The following code gives an error - &quot;No implicit conversion from DBnull to int.&quot;

    SqlParameter[] parameters = new SqlParameter[1];    
    SqlParameter planIndexParameter = new SqlParameter(&quot;@AgeIndex&quot;, SqlDbType.Int);
    planIndexParameter.Value = (AgeItem.AgeIndex== null) ? DBNull.Value : AgeItem.AgeIndex;
    parameters[0] = planIndexParameter;

Assign null to a SqlParameter

I know that its possible to convert a List of KeyValuePair into a Dictionary, but is there a quick way (besides looping through manually) to perform the vice versa operation? 

     
This would be the manual way,

    foreach (KeyValuePair&lt;double,double&gt; p in dict)
    {
        list.Add(new KeyValuePair&lt;double,double&gt;(p.Key,p.Value));
    }

Not really that bad but I was just curious.



Convert dictionary to List&lt;KeyValuePair&gt;

**HashSet**
The C# HashSet data structure was introduced in the .NET Framework 3.5. A full list of the implemented members can be found at the [HashSet MSDN][1] page.


 2. Where is it used?
 3. Why would you want to use it?


  [1]: http://msdn.microsoft.com/en-us/library/bb359438.aspx

Define: What is a HashSet?

I am working in progress bar concept in ASP.NET MVC 2. Here i have a DropDownList which has 10 values. i want to calculate the percentage for progress bar, e.g. 10 values from DropDownList and i am having a query which returns the value 2. so, out of 10 values i am getting 2. &quot;20 % completed&quot; should be displayed.. How to do this calculation

Percentage calculation

I am trying to format a textblock which is bound to a `TimeSpan` property. It works if the property is of type `DateTime` but it fails if it is a `TimeSpan`. I can get it done using a converter. But I am trying to find out if there is any alternatives.

Sample Code:

   
    public TimeSpan MyTime { get; set; }

    public Window2()
    {
        InitializeComponent();
        MyTime = DateTime.Now.TimeOfDay;
        DataContext = this;
    }

**Xaml**

    &lt;TextBlock Text=&quot;{Binding MyTime,StringFormat=HH:mm}&quot;/&gt;

I am expecting the textblock to show only hours and mintes. But it is showing as:

&gt; 19:10:46.8048860



How to format TimeSpan in XAML

The DataContractJsonSerializer is not able to serialize Dictionaries properly.

Whereas JavaScriptSerializer serializes Dictionaries as `{&quot;abc&quot;:&quot;xyz&quot;,&quot;def&quot;:42}` 
for example,
the DataContractJsonSerializer gives `[{&quot;Key&quot;:&quot;abc&quot;,&quot;Value&quot;:&quot;xyz&quot;},{&quot;Key&quot;:&quot;def&quot;,&quot;Value&quot;:42}]` instead. 

This is really problematic and I want to know how can I serialize Dictionary objects correctly in my WCF service. I am looking for a solution that would require least amount of effort.

ref: http://msdn.microsoft.com/en-us/library/bb412170.aspx

This is the workaround I finally used to serilize dictionaries properly in WCF: http://social.msdn.microsoft.com/forums/en-US/wcf/thread/765f1569-0422-4471-8ec2-1d03b2026771

Any way to make DataContractJsonSerializer serialize Dictionaries properly?

I know it sounds stupid, but I&#39;ve tried everything to stop a timer, but the timer won&#39;t stop. I&#39;m working on a game and i would appreciate if someone could tell me how to stop a timer.

C# - how do you stop a timer?

How can I use NuGet to add a library package reference, when I have Visual C# 2010 Express?

NuGet doesn&#39;t come up when I search for it in Tools &gt; Extension Manager.

I downloaded &quot;NuGet Package Manager&quot; (the .vsix) from the &lt;a href=&quot;http://nuget.codeplex.com/releases/view/57706&quot;&gt;downloads page&lt;/a&gt;, but when it prompts me for which versions of Visual studio to integrate into, it only lists Visual Web Developer Express 2010. Visual C# Express isn&#39;t shown. So I guess it would work with Silverlight in VWD, but I want to use it with WPF.

One of the documentation pages linked me to the &lt;a href=&quot;http://nuget.codeplex.com/releases/view/52017&quot;&gt;1.0 CTP download page&lt;/a&gt;, which included a command-line version of NuGet (no longer present in the latest version). But the command-line version seems to be crippled -- the only operation it seems to support is building a package for distribution; it doesn&#39;t seem to support the commands for adding a reference to a library package.

Is there any way at all to use NuGet with Visual C# Express?

How can I use NuGet with Visual C# Express?

F# has *sequences* that allows to create sequences:

    seq { 0 .. 10 }

Create sequence of numbers from 0 to 10.

Is there something similar in C#?

How to create a sequence of integers in C#?

The question pretty much says it all.

I have a window, and have tried to set the DataContext using the full namespace to the ViewModel, but I seem to be doing something wrong.

    &lt;Window x:Class=&quot;BuildAssistantUI.BuildAssistantWindow&quot;
        xmlns=&quot;http://schemas.microsoft.com/winfx/2006/xaml/presentation&quot;
        xmlns:x=&quot;http://schemas.microsoft.com/winfx/2006/xaml&quot;
        DataContext=&quot;BuildAssistantUI.ViewModels.MainViewModel&quot;&gt;

How do I set a ViewModel on a window in XAML using DataContext property?

I have a python `datetime` instance that was created using `datetime.utcnow()` and persisted in database.

For display, I would like to convert the `datetime` instance retrieved from the database to local `datetime` using the default local timezone (i.e., as if the `datetime` was created using `datetime.now()`).

How can I convert the UTC `datetime` to a local `datetime` using only python standard library (e.g., no `pytz` dependency)?

It seems one solution would be to use `datetime.astimezone(tz)`, but how would you get the default local timezone?


How to convert a UTC datetime to a local datetime using only standard library?

I&#39;m writing a function that needs to parse string to a `timedelta`. The user must enter something like `&quot;32m&quot;` or `&quot;2h32m&quot;`, or even `&quot;4:13&quot;` or `&quot;5hr34m56s&quot;`... Is there a library or something that has this sort of thing already implemented?

How to construct a timedelta object from a simple string

Is it possible to have Entity Framework (I am using the Code First Approach with CTP5 currently) store all DateTime values as UTC in the database?

Or is there maybe a way to specify it in the mapping, for example in this one for the last_login column:

    modelBuilder.Entity&lt;User&gt;().Property(x =&gt; x.Id).HasColumnName(&quot;id&quot;);
    modelBuilder.Entity&lt;User&gt;().Property(x =&gt; x.IsAdmin).HasColumnName(&quot;admin&quot;);
    modelBuilder.Entity&lt;User&gt;().Property(x =&gt; x.IsEnabled).HasColumnName(&quot;enabled&quot;);
    modelBuilder.Entity&lt;User&gt;().Property(x =&gt; x.PasswordHash).HasColumnName(&quot;password_hash&quot;);
    modelBuilder.Entity&lt;User&gt;().Property(x =&gt; x.LastLogin).HasColumnName(&quot;last_login&quot;);

Entity Framework DateTime and UTC

I tried doing something like 

    Time.now + 5.days

but that doesn&#39;t work, even though I vaguely remember seeing, and being very impressed, with being able to do something like `2.years` etc. 

How do I do that in Rails 3?


How to add 10 days to current time in Rails

I&#39;m a bit of a rambler, but I&#39;ll try to keep this clear -

I&#39;m bored, so I&#39;m working on a **&quot;shoutbox&quot;**, and I&#39;m a little confused over one thing. I want to get the time that a message is entered, and I want to make sure I&#39;m getting the server time, or at least make sure I&#39;m not getting the local time of the user. I know it doesn&#39;t matter, since this thing won&#39;t be used by anyone besides me, but I want to be thorough. I&#39;ve looked around and tested a few things, and I think the only way to do this is to get the milliseconds since **January 1, 1970 00:00:00 UTC**, since that&#39;d be the same for everyone.

I&#39;m doing that like so:

    var time = new Date();
    var time = time.getTime();

That returns a number like `1294862756114`.

Is there a way to convert `1294862756114` to a more readable date, like `DD/MM/YYYY HH:MM:SS`?

So, basically, I&#39;m looking for JavaScript&#39;s equivalent of PHP&#39;s `date();` function.


Content Type	Original Author	Original Content on Stackoverflow
Question	anon	View Question on Stackoverflow
Solution 1 - C#	Nick Craver	View Answer on Stackoverflow
Solution 2 - C#	RB.	View Answer on Stackoverflow
Solution 3 - C#	Shadow Wizard Says No More War	View Answer on Stackoverflow
Solution 4 - C#	Suhumar	View Answer on Stackoverflow
Solution 5 - C#	Hezi	View Answer on Stackoverflow

How does DateTime.Now.Ticks exactly work?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Solution 5 - C#

Removing extras from passed-in Intent

Firing event on DOM attribute change

Attributions