    Console.WriteLine(DateTime.Now.ToString(&quot;ddd M/dd/yy&quot;, CultureInfo.InvariantCulture));
                Console.ReadLine();

try the above 

You could also use

    Console.WriteLine(dateTime.ToString(&quot;ddd M&#39;/&#39;dd&#39;/&#39;yy&quot;));

That&#39;s a possible solution if you&#39;re not using the invariant culture as mentioned in other answers here.

The default behavior of the &quot;/&quot; (slash) in a format argument is to use the current&#39;s culture date separator.

To force the &quot;/&quot; (slash), you must precede it with a &quot;\&quot; (backslash).

Ex.: &quot;yyyy\\\\/MM\\\\/dd&quot; will always display a date like &quot;2015/07/02&quot; independent of the current culture in use.

I have an array in Bash, each element is a string. How can I append another string to each element? In Java, the code is something like:

    for (int i=0; i&lt;array.length; i++)
    {
        array[i].append(&quot;content&quot;);
    }

How to append a string to each element of a Bash array?

Running Postgres 7.4 (Yeah we are in the midst of upgrading)

I need to store from 1 to 100 selected items into one field in a database. 98% of the time it&#39;s just going to be 1 item entered, and 2% of the time (if that) there will be multiple items.

The items are nothing more than a text description, (as of now) nothing more than 30 characters long.  They are static values the user selects.

Wanted to know the optimal column data type used to store the desired data. I was thinking BLOB but didn&#39;t know if this is a overkill. Maybe JSON?

Also I did think of ENUM but as of now I can&#39;t really do this since we are running Postgres 7.4

I also wanted to be able to easily identify the item(s) entered so no mappings or referencing tables.

How to store array or multiple values in one column

If I do this in C#:

    Console.WriteLine(DateTime.Now.ToString(&quot;ddd M/dd/yy&quot;));

I would expect output like this:

    Wed 6/15/11

But it actually outputs this:

    Wed 6 15 11

Why are the slashes disappearing? Is there a way to prevent this and have the date outputted in the expected format?

C# date formatting is losing slash separators

If I do this in C#:
<pre><code class="hljs language-arduino">Console.WriteLine(DateTime.Now.ToString("ddd M/dd/yy"));
</code></pre>
I would expect output like this:
<pre><code class="hljs">Wed 6/15/11
</code></pre>
But it actually outputs this:
<pre><code class="hljs">Wed 6 15 11
</code></pre>
Why are the slashes disappearing? Is there a way to prevent this and have the date outputted in the expected format?

I&#39;m calculating the distance between two GeoCoordinates. I&#39;m testing my app against 3-4 other apps. When I&#39;m calculating distance, I tend to get an average of 3.3 miles for my calculation whereas other apps are getting 3.5 miles. It&#39;s a big difference for the calculation I&#39;m trying to perform. Are there any good class libraries out there for calculating distance? I&#39;m calculating it like this in C#:

    public static double Calculate(double sLatitude,double sLongitude, double eLatitude, 
                                   double eLongitude)
    {
        var radiansOverDegrees = (Math.PI / 180.0);

        var sLatitudeRadians = sLatitude * radiansOverDegrees;
        var sLongitudeRadians = sLongitude * radiansOverDegrees;
        var eLatitudeRadians = eLatitude * radiansOverDegrees;
        var eLongitudeRadians = eLongitude * radiansOverDegrees;

        var dLongitude = eLongitudeRadians - sLongitudeRadians;
        var dLatitude = eLatitudeRadians - sLatitudeRadians;

        var result1 = Math.Pow(Math.Sin(dLatitude / 2.0), 2.0) + 
                      Math.Cos(sLatitudeRadians) * Math.Cos(eLatitudeRadians) * 
                      Math.Pow(Math.Sin(dLongitude / 2.0), 2.0);

        // Using 3956 as the number of miles around the earth
        var result2 = 3956.0 * 2.0 * 
                      Math.Atan2(Math.Sqrt(result1), Math.Sqrt(1.0 - result1));

        return result2;
    }

What could I be doing wrong? Should I calculate it in km first and then convert to miles?

Calculating Distance between two Latitude and Longitude GeoCoordinates

**Note** This is *not* a question about how to implement or emulate duck typing in C#...

For several years I was under the impression that certain C# language features were depdendent on data structures defined in the language itself (which always seemed like an odd chicken &amp; egg scenario to me). For example, I was under the impression that the `foreach` loop was only available to use with types that implemented `IEnumerable`.

Since then I&#39;ve come to understand that the C# compiler uses duck typing to determine whether an object can be used in a foreach loop, looking for a `GetEnumerator` method rather than `IEnumerable`. This makes a lot of sense as it removes the chicken &amp; egg conundrum.

I&#39;m a little confused as to why this isn&#39;t doesn&#39;t seem to be the case with the `using` block and `IDisposable`. Is there any particular reason the compiler can&#39;t use duck typing &amp; look for a `Dispose` method? What&#39;s the reason for this inconsistency?

Perhaps there&#39;s something else going on under the hood with IDisposable?

*Discussing why you would **ever** have an object with a Dispose method that didn&#39;t implement IDisposable is outside the scope of this question :)*

Duck typing in the C# compiler

This is my method which gives me error.

    public List&lt;Project&gt; GetProjectForCombo()
    {
        using (MyDataContext db = new MyDataContext (DBHelper.GetConnectionString()))
        {
            var query = from pro in db.Projects
                        select new { pro.ProjectName, pro.ProjectId };

            return query.ToList();
        }
    }

If i change it with this:

    public List&lt;Project&gt; GetProjectForCombo()
    {
        using (MyDataContext db = new MyDataContext (DBHelper.GetConnectionString()))
        {
            var query = from pro in db.Projects
                        select pro;

            return query.ToList();
        }
    }

Then it works fine with no errors.

Can you please let me know that how I can return only `ProjectId` and `ProjectNam`?


Return list using select new in LINQ

Which of the following two is more efficient? (Or maybe is there a third option that&#39;s better still?)

    string val = &quot;AStringValue&quot;;

    if (val.Equals(&quot;astringvalue&quot;, StringComparison.InvariantCultureIgnoreCase))

OR

    if (val.ToLowerCase() == &quot;astringvalue&quot;)

?


Comparing two strings, ignoring case in C#

&gt; **Possible Duplicate:**  
&gt; [How do I enumerate all time zones in .NET?](https://stackoverflow.com/questions/442019/how-do-i-enumerate-all-time-zones-in-net)  

&lt;!-- End of automatically inserted text --&gt;

How can I get the list of time zones with c#?&lt;be/&gt;
I want a list like the one windows has.

Get Time Zones list in c#

How to get current date and time from internet or server using C#? I am trying to get time as follows:

    public static DateTime GetNetworkTime (string ntpServer)
    {
        IPAddress[] address = Dns.GetHostEntry(ntpServer).AddressList;

        if (address == null || address.Length == 0)
            throw new ArgumentException(&quot;Could not resolve ip address from &#39;&quot; + ntpServer + &quot;&#39;.&quot;, &quot;ntpServer&quot;);

        IPEndPoint ep = new IPEndPoint(address[0], 123);
        return GetNetworkTime(ep);
    }

I am passing server IP address as `netServer`, but it does not work properly.

How to get DateTime from the internet?

I get confused by the Java API for the Date class. Everything seems to be deprecated and links to the Calendar class. So I started using the Calendar objects to do what I would have liked to do with a Date, but intuitively it kind of bothers me to use a Calendar object when all I really want to do is create and compare two dates.

Is there a simple way to do that? For now I do

    Calendar cal = Calendar.getInstance();
    cal.setTimeInMillis(0);
    cal.set(year, month, day, hour, minute, second);
    Date date = cal.getTime(); // get back a Date object






What&#39;s the right way to create a date in Java?

From the server I get a datetime variable in this format: `6/29/2011 4:52:48 PM` and it is in UTC time. I want to convert it to the current user’s browser time zone using JavaScript.

How this can be done using JavaScript or jQuery?

Convert UTC date time to local date time

Can anyone explain the difference between `System.DateTime.Now` and `System.DateTime.Today` in C#.NET? Pros and cons of each if possible.

Difference between System.DateTime.Now and System.DateTime.Today

How can I get the month name from the month number?


For instance, if I have `3`, I want to return `march` 

    date.tm_month()

How to get the string `march`?

Get month name from number

Primitive question, but how do I format strings like this:

&gt; &quot;Step {1} of {2}&quot;

 by substituting variables using Java? In C# it&#39;s easy.

How to format strings in Java

I have a function to add commas to numbers:

    function commafy( num ) {
      num.toString().replace( /\B(?=(?:\d{3})+)$/g, &quot;,&quot; );
    }

Unfortunately, it doesn&#39;t like decimals very well. Given the following usage examples, what is the best way to extend my function?


    commafy( &quot;123&quot; )                 // &quot;123&quot;
    commafy( &quot;1234&quot; )                // &quot;1234&quot;
                                     // Don&#39;t add commas until 5 integer digits
    commafy( &quot;12345&quot; )               // &quot;12,345&quot;
    commafy( &quot;1234567&quot; )             // &quot;1,234,567&quot;
    commafy( &quot;12345.2&quot; )             // &quot;12,345.2&quot;
    commafy( &quot;12345.6789&quot; )          // &quot;12,345.6789&quot;
                                     // Again, nothing until 5
    commafy( &quot;.123456&quot; )             // &quot;.123 456&quot;
                                     // Group with spaces (no leading digit)
    commafy( &quot;12345.6789012345678&quot; ) // &quot;12,345.678 901 234 567 8&quot;

Presumably the easiest way is to first split on the decimal point (if there is one). Where best to go from there?


Add commas or spaces to group every three digits


    String hello = &quot;Hello&quot;;
    
    String.format(&quot;%s %s %s %s %s %s&quot;, hello, hello, hello, hello, hello, hello);

    hello hello hello hello hello hello 

Does the `hello` variable need to be repeated multiple times in the call to the format method or is there a shorthand version that lets you specify the argument once to be applied to all of the `%s` tokens?

Reuse a parameter in String.format?

How can I display this:

Decimal(&#39;40800000000.00000000000000&#39;) as &#39;4.08E+10&#39;?

I&#39;ve tried this:

    &gt;&gt;&gt; &#39;%E&#39; % Decimal(&#39;40800000000.00000000000000&#39;)
    &#39;4.080000E+10&#39;

But it has those extra 0&#39;s.



Display a decimal in scientific notation

I have got a price field to display which sometimes can be either 100 or 100.99 or 100.9, What I want is to display the price in 2 decimal places only if the decimals are entered for that price , for instance if its 100 so it should only show 100 not 100.00 and if the price is 100.2 it should display 100.20 similarly for 100.22 should be same .
I googled and came across some examples but they didn&#39;t match exactly what i wanted :

    // just two decimal places
    String.Format(&quot;{0:0.00}&quot;, 123.4567);      // &quot;123.46&quot;
    String.Format(&quot;{0:0.00}&quot;, 123.4);         // &quot;123.40&quot;
    String.Format(&quot;{0:0.00}&quot;, 123.0);         // &quot;123.00&quot;

Content Type	Original Author	Original Content on Stackoverflow
Question	Jon Tackabury	View Question on Stackoverflow
Solution 1 - C#	David	View Answer on Stackoverflow
Solution 2 - C#	Norbert	View Answer on Stackoverflow
Solution 3 - C#	BaRtEr	View Answer on Stackoverflow

C# date formatting is losing slash separators

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

How to store array or multiple values in one column

How to append a string to each element of a Bash array?

Attributions