`myByte.ToString(&quot;X2&quot;)` I believe.

Maybe you like to do it as below:

    private static void byte2hex(byte b, StringBuilder buf)
        {
            char[] hexChars = { &#39;0&#39;, &#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;4&#39;, &#39;5&#39;, &#39;6&#39;, &#39;7&#39;, &#39;8&#39;, &#39;9&#39;,
                                &#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39; };
            int high = ((b &amp; 0xf0) &gt;&gt; 4);
            int low = (b &amp; 0x0f);
            buf.Append(hexChars[high]);
            buf.Append(hexChars[low]);
        }

Is it possible to get the nth-child pseudo-selector to work with a specific class?

See this example:
http://jsfiddle.net/fZGvH/

I want to have the second DIV.red turn red, but it doesn&#39;t apply the color as expected.

Not only that, but when you specify this, it changes the 5th DIV to red:

    div.red:nth-child(6)

When you specify this, it changes the 8th DIV to red:

    div.red:nth-child(9)

It seems to be one DIV behind. There are only 8 DIV tags in the example so I don&#39;t know why nth-child(9) even works. Testing using Firefox 3.6, but in my actual production code the same problem occurs in Chrome. I&#39;m not understanding something about how this is supposed to work, would appreciate clarification.

Also, this will change the 6th DIV to red, but what I actually want is for it to change the second DIV.red to red:

    div.red:nth-of-type(6)

And I don&#39;t understand why nth-child() and nth-of-type() respond differently, since there are only eight tags of the same type in the document.


nth-child doesn&#39;t respond to class

I have an array of objects.

Is it possible to make a new array that is a copy of this array, but in reverse order?
I was looking for something like this. 

    // my array
    ArrayList&lt;Element&gt; mElements = new ArrayList&lt;Element&gt;();
    // new array
    ArrayList&lt;Element&gt; tempElements = mElements;
    
    tempElements.reverse(); // something to reverse the order of the array



android - reverse the order of an array

I can turn a byte into a hexadecimal number like this:

    myByte.ToString(&quot;X&quot;)

but it will have only one digit if it is less than 0x10. I need it with a leading zero. Is there a format string that makes it possible to do this in a single call to `ToString`?

Turn byte into two-digit hexadecimal number just using ToString?

I can turn a byte into a hexadecimal number like this:
<pre><code class="hljs language-arduino">myByte.ToString("X")
</code></pre>
but it will have only one digit if it is less than 0x10. I need it with a leading zero. Is there a format string that makes it possible to do this in a single call to <code>ToString</code>?

I am using `System.Windows.Forms` but strangely enough don&#39;t have the ability to create them.

How can I get something like a javascript prompt dialog, without javascript?

MessageBox is nice, but there is no way for the user to enter an input.

I want the user to enter any text input possible.

Prompt Dialog in Windows Forms

I have a array of int  which I have to sort by descending.

Since I did not find any method to sort the array in descending order.Currently I am sorting the array in descending order as below


    int[] array = new int[] { 3, 1, 4, 5, 2 };
    Array.Sort&lt;int&gt;( array );
    Array.Reverse( array );


**Now,the question is that.Is there any better way to do the same in c#?**




Better way to sort array in descending order

How do I convert a `byte` array to a `char` array in C#?

Convert byte[] to char[]

How can I *pull* (maybe *push* too) some folder from GitHub?

I mean I need API for .NET to access within C#, not GUI for git.

Is there some way to work with git using .NET application?

I&#39;ve got a short piece of code that originally created an **SqlDataAdapter** object over and over.

Trying to streamline my calls a little bit, I replaced the **SqlDataAdapter** with an **SqlCommand** and moved the **SqlConnection** outside of the loop.

Now, whenever I try to edit rows of data returned to my **DataTable**, I get a **ReadOnlyException** thrown that was not thrown before.

NOTE: I have a custom function that retrieves the employee&#39;s full name based on their ID. For simplicity here, I used &quot;John Doe&quot; in my example code below to demonstrate my point.

*ExampleQueryOld* works with the **SqlDataAdapter**; *ExampleQueryNew* fails with the **ReadOnlyException** whenever I try to write to an element of the **DataRow**:

 - *ExampleQueryOld*

This works and has no issues:

    public static DataTable ExampleQueryOld(string targetItem, string[] sqlQueryStrings) {
      DataTable bigTable = new DataTable();
      for (int i = 0; i &lt; sqlQueryStrings.Length; i++) {
        string sqlText = sqlQueryStrings[i];
        DataTable data = new DataTable(targetItem);
        using (SqlDataAdapter da = new SqlDataAdapter(sqlText, Global.Data.Connection)) {
          try {
            da.Fill(data);
          } catch (Exception err) {
            Global.LogError(_CODEFILE, err);
          }
        }
        int rowCount = data.Rows.Count;
        if (0 &lt; rowCount) {
          int index = data.Columns.IndexOf(GSTR.Employee);
          for (int j = 0; j &lt; rowCount; j++) {
            DataRow row = data.Rows[j];
            row[index] = &quot;John Doe&quot;; // This Version Works
          }
          bigTable.Merge(data);
        }
      }
      return bigTable;
    }

 - *ExampleQueryNew*

This example throws the ReadOnlyException:

    public static DataTable ExampleQueryNew(string targetItem, string[] sqlQueryStrings) {
      DataTable bigTable = new DataTable();
      using (SqlConnection conn = Global.Data.Connection) {
        for (int i = 0; i &lt; sqlQueryStrings.Length; i++) {
          string sqlText = sqlQueryStrings[i];
          using (SqlCommand cmd = new SqlCommand(sqlText, conn)) {
            DataTable data = new DataTable(targetItem);
            try {
              if (cmd.Connection.State == ConnectionState.Closed) {
                cmd.Connection.Open();
              }
              using (SqlDataReader reader = cmd.ExecuteReader()) {
                data.Load(reader);
              }
            } catch (Exception err) {
              Global.LogError(_CODEFILE, err);
            } finally {
              if ((cmd.Connection.State &amp; ConnectionState.Open) != 0) {
                cmd.Connection.Close();
              }
            }
            int rowCount = data.Rows.Count;
            if (0 &lt; rowCount) {
              int index = data.Columns.IndexOf(GSTR.Employee);
              for (int j = 0; j &lt; rowCount; j++) {
                DataRow row = data.Rows[j];
                try {
                  // ReadOnlyException thrown below: &quot;Column &#39;index&#39;  is read only.&quot;
                  row[index] = &quot;John Doe&quot;;
                } catch (ReadOnlyException roErr) {
                  Console.WriteLine(roErr.Message);
                }
              }
              bigTable.Merge(data);
            }
          }
        }
      }
      return bigTable;
    }

Why can I write to the **DataRow** element in one case, but not in the other?

Is it because the **SqlConnection** is still open or is the **SqlDataAdapter** doing something behind the scene?

ReadOnlyException DataTable DataRow &quot;Column X is read only.&quot;

How does the [`ILookup&lt;key, value&gt;`][1] interface differ from [`IDictionary&lt;key, value&gt;`](http://msdn.microsoft.com/en-us/library/s4ys34ea.aspx)?

I don&#39;t understand what the [`ILookup`][1] interface is meant for.


  [1]: http://msdn.microsoft.com/en-us/library/bb534291.aspx

ILookup interface vs IDictionary

After reading this blog entry : [http://wekeroad.com/post/4069048840/when-should-a-method-be-a-property][1],

I&#39;m wondering why Microsoft choose in C# :

    DateTime aDt = DateTime.Now;

instead of

    DateTime aDt = DateTime.Now();

- Best practices say : Use a method when calling the member twice in succession produces different results
- And &lt;code&gt;DateTime.Now&lt;/code&gt; is perfect example of non-determistic method/property.

Do you know if there any reason for that design ?&lt;br/&gt;
Or if it&#39;s just a small mistake ?


  [1]: https://web.archive.org/web/20110821003841/http://wekeroad.com:80/post/4069048840/when-should-a-method-be-a-property

Why is DateTime.Now a property and not a method?

I&#39;ve seen countless posts on how variable capture pulls in variables for the creation of the closure, however they all seem to stop short of specific details and call the whole thing &quot;compiler magic&quot;.

I&#39;m looking for a clear-cut explanation of:

 1. How local variables are *actually* captured. 
 2. The difference (if any) between capturing value types vs. reference types.
 3. And whether there is any boxing occurring with respect to value types. 

My preference would be for an answer in terms of values and pointers (closer to the heart of what happens internally), though I will accept a clear answer involving values and references as well.

Detailed Explanation of Variable Capture in Closures

I have something like:

    String text = &quot;The user {0} has email address {1}.&quot;
    // params = { &quot;Robert&quot;, &quot;myemailaddr@gmail.com&quot; }
    String msg = MessageFormat.format(text, params);

This isn&#39;t great for me, because sometimes my translators are not sure what goes in the {0} and {1}, also it would be nice to be able to reword the messages without worrying about the order of the args.

I&#39;d like to replace the arguments with readable names instead of numbers.  Something like this:

    String text = &quot;The user {USERNAME} has email address {EMAILADDRESS}.&quot;
    // Map map = new HashMap( ... [USERNAME=&quot;Robert&quot;, EMAILADDRESS=&quot;myemailaddr@gmail.com&quot;]
    String msg = MessageFormat.format(text, map);

Is there an easy way to do this?  

Thanks!
rob

How to format message with argument names instead of numbers?

Non-working example:

    print(&quot; \{ Hello \} {0} &quot;.format(42))

Desired output:

```none
 {Hello} 42 
```

How do I print curly-brace characters in a string while using .format?

I would like to display Yes/No in different languages according to some boolean variable.  
Is there a generic way to format it according to the locale passed to it?  
If there isn&#39;t, what is the standard way to format a boolean besides `boolVar ? Resources.Yes : Resources.No`.  
I&#39;m guessing that `boolVar.ToString(IFormatProvider)` is involved.  
Is my assumption correct?

How to generically format a boolean to a Yes/No string?

I want to fill out a string with spaces. I know that the following works for zero&#39;s:

    &gt;&gt;&gt; print  &quot;&#39;%06d&#39;&quot;%4
    &#39;000004&#39;

But what should I do when I want this?:

    &#39;hi    &#39;

of course I can measure string length and do `str+&quot; &quot;*leftover`, but I&#39;d like the shortest way.

How can I fill out a Python string with spaces?

On [Learn Python the Hard Way](http://learnpythonthehardway.org/) page 21, I see this code example:

    x = &quot;There are %d types of people.&quot; % 10
    ...
    print &quot;I said: %r.&quot; % x

Why is `%r` used here instead of `%s`?  When would you use `%r`, and when would you use `%s`?

Content Type	Original Author	Original Content on Stackoverflow
Question	Timwi	View Question on Stackoverflow
Solution 1 - C#	Roman Starkov	View Answer on Stackoverflow
Solution 2 - C#	Ali Tofigh	View Answer on Stackoverflow

Turn byte into two-digit hexadecimal number just using ToString?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

android - reverse the order of an array

nth-child doesn't respond to class

Attributions