You can set the [ReadOnly property][1] to true.

Quoth the link:

&gt; When this property is set to true, the contents of the control cannot
&gt; be changed by the user at runtime. With this property set to true, you
&gt; can still set the value of the Text property in code. You can use this
&gt; feature instead of disabling the control with the Enabled property to
&gt; allow the contents to be copied and ToolTips to be shown.

[1]:  http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.readonly.aspx

The `TextBox` has a property called `ReadOnly`.  If you set that property to true then the `TextBox` will still be able to scroll but the user wont be able to change the value.

As mentioned above, you can change the property of the textbox &quot;Read Only&quot; to &quot;True&quot; from the properties window.

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/hIEek.png

            textBox1.ReadOnly = true;
&quot;true&quot; property will make the text box readonly activate. and &quot;false&quot; will make it in regular form. Thanks.

I need to create a summary table at the end of a log with some values that 
are obtained inside a class. The table needs to be printed in fixed-width 
format. I have the code to do this already, but I need to limit Strings, 
doubles and ints to a fixed-width size that is hard-coded in the code.

So, suppose I want to print a fixed-width table with

        int,string,double,string
        int,string,double,string
        int,string,double,string
        int,string,double,string

        and the fixed widths are: 4, 5, 6, 6.

If a value exceeds this width, the last characters need to be cut off. So 
for example:

        124891, difference, 22.348, montreal

the strings that need to be printed ought to be:

        1248 diffe 22.348 montre

I am thinking I need to do something in the constructor that forces a 
string not to exceed a certain number of characters. I will probably 
cast the doubles and ints to a string, so I can enforce the maximum width 
requirements.

I don&#39;t know which method does this or if a string can be instantiated to 
behave taht way.  Using the formatter only helps with the 
fixed-with formatting for printing the string, but it does not actually 
chop characters that exceed the maximum length.

Limiting the number of characters in a string, and chopping off the rest

I am currently going to start from scratch with the phpunit tests for a project. So I was looking into some projects (like Zend) to see how they are doing things and how they organizing their tests.

Most things are pretty clear, only thing I have some problems with is how to organize the test suites properly.
Zend has an AllTests.php from which loads others test suites.   
Tough looking at the class it is useing `PHPUnit_Framework_TestSuite` to create a suite object and then add the other suites to it, but if I look in the PHPUnit docs for organizing tests in PHPUnit versions after 3.4 there is only a description for XML or FileHierarchy. The one using classes to organize the tests was removed.  
I haven&#39;t found anything that this method is deprecated and projects like Zend are still using it.

But if it is deprecated, how would I be able to organize tests in the same structure with the xml configuration? Executing all tests is no problem, but how would I organize the tests (in the xml) if I only wanted to execute a few tests. Maybe creating several xmls where I only specify a few tests/test suites to be run?  

So if I would want to only test module1 and module2 of the application, would I have an extra xml for each and defining test suites only for those modules (classes used by the module) in it. And also one that defines a test suite for all tests?  

Or would it be better to use the `@group` annotation on the specific tests to mark them to be for module1 or module2?  

Thanks in advance for pointing me to some best practices.

PHPUnit best practices to organize tests

I want to use a text box to display some text. I can not disable it, because then the scroll bar will not work.

How can I prevent editing within the multi-line textbox, yet make it appear as if it is enabled, so that the scroll bar works correctly?

How to disable textbox from editing?

<p>I want to use a text box to display some text. I can not disable it, because then the scroll bar will not work.</p>
<p>How can I prevent editing within the multi-line textbox, yet make it appear as if it is enabled, so that the scroll bar works correctly?</p>


I have a string that contains invalid XML characters. How can I escape (or remove) invalid XML characters before I parse the string?

Escape invalid XML characters in C#

There are multiple places in an Open Source Project (OSP) code I contribute, where it has to be determined if an element in a collection satisfies a certain condition.

I&#39;ve seen the use of LINQ expression `Any(lambda expression)` in some cases and `FirstOrDefault(lambda expression) != null` in others but never given a thought about it.

I have reached now a point where I have to do some iterations to collections made from  queries to a DB and want to optimize the runtime.

So I figured that `FirstOrDefault(lambda expression) != null` should be faster than `Any(lambda expression)`,right?

In the case of `FirstOrDefault(lambda expression) != null`, the iteration (probably) stops when it finds an element that satisfies the condition (worse case scenario it iterates through the entire collection and returns `null`).

In the case of `Any(lambda expression)` I imagine that the iteration continues to the end of the collection even if an element that satisfies the condition is found.

Edit: The above is not true as Jackson Pope mentioned and linked the related MSDN article.

Are my thoughts correct or am I missing something?


Performance of LINQ Any vs FirstOrDefault != null

    public List&lt;string&gt; GetpathsById(List&lt;long&gt; id)
    {
        long[] aa = id.ToArray();
            long x;
        List&lt;string&gt; paths = new List&lt;string&gt;();
        for (int i = 0; i &lt; id.Count; i++)
        {
            x = id[i];
            Presentation press = context.Presentations.Where(m =&gt; m.PresId == aa[i]).FirstOrDefault();
            paths.Add(press.FilePath);
        }
        return paths;
    }

This code throws the following exception: `The LINQ expression node type &#39;ArrayIndex&#39; is not supported in LINQ to Entities.` 

However, if I supply `x` instead of `aa[i]` it works.

Why?


The LINQ expression node type &#39;ArrayIndex&#39; is not supported in LINQ to Entities

My project missing `System.Windows.Interactivity`. Google says that I have to install Expression Blend, but on my other computer I have this library and I don&#39;t have Expression Blend installed. So there should be another way to obtain `System.Windows.Interactivity`? What should I do? (right now i don&#39;t have another computer so I can not just copy this library :)

How to add System.Windows.Interactivity to project?

In C#, there is a nice syntax sugar for fields with getter and setter. Moreover, I like the auto-implemented properties which allow me to write

    public Foo foo { get; private set; }

In C++ I have to write

    private:
        Foo foo;
    public:
        Foo getFoo() { return foo; }

Is there some such concept in the C++11 allowing me to have some syntax sugar on this?

Does C++11 have C#-style properties?

I need to force the `DataGridView` to show the selected `row`.

In short, I have a `textbox` that changes the `DGV` selection based on what is typed into the `textbox`.  When this happens, the selection changes to the matching `row`.

Unfortunately if the selected `row` is out of the view, I have to manually scroll down to find the selection.  Does anyone know how to force the `DGV` to show the selected `row`?

Thanks!

How do I make the DataGridView show the selected row?

What are the differences between `.ContextMenu` and `.ContextMenuStrip` in Windows Forms?

I already know what a `ContextMenu` is, but how is `ContextMenuStrip` different from `ContextMenu`?

Differences between .ContextMenu and .ContextMenuStrip

How can i add a line of text to a [multi-line][1] [`TextBox`][2]?

e.g. pseudocode;

    textBox1.Clear();
    textBox1.Lines.Add(&quot;1000+&quot;);
    textBox1.Lines.Add(&quot;750-999&quot;);
    textBox1.Lines.Add(&quot;400-749&quot;);
    ...snip...
    textBox1.Lines.Add(&quot;40-59&quot;);

or

    textBox1.Lines.Append(&quot;brown&quot;);
    textBox1.Lines.Append(&quot;brwn&quot;);
    textBox1.Lines.Append(&quot;brn&quot;);
    textBox1.Lines.Append(&quot;brow&quot;);
    textBox1.Lines.Append(&quot;br&quot;);
    textBox1.Lines.Append(&quot;brw&quot;);
    textBox1.Lines.Append(&quot;brwm&quot;);
    textBox1.Lines.Append(&quot;bron&quot;);
    textBox1.Lines.Append(&quot;bwn&quot;);
    textBox1.Lines.Append(&quot;brnw&quot;);
    textBox1.Lines.Append(&quot;bren&quot;);
    textBox1.Lines.Append(&quot;broe&quot;);
    textBox1.Lines.Append(&quot;bewn&quot;);

The only methods that [TextBox.Lines][3] implements (that i can see) are:

- Clone
- CopyTo
- Equals
- GetType
- GetHashCode
- GetEnumerator
- Initialize
- GetLowerBound
- GetUpperBound
- GetLength
- GetLongLength
- GetValue
- SetValue
- ToString

![enter image description here][4]


  [1]: http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.multiline%28v=VS.80%29.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.windows.forms.textbox%28v=VS.80%29.aspx
  [3]: http://msdn.microsoft.com/en-US/library/system.windows.forms.textboxbase.lines%28v=VS.80%29.aspx
  [4]: http://i.stack.imgur.com/faVJn.png

How to add a line to a multiline TextBox?

I am making an event to check if specific tab page in a tab control is active.

The point is, it will trigger an event if that tab page in a tab control is the currently selected tab. Any code that will give me what I need?

Check if a specific tab page is selected (active)

I have a `private readonly` list of `LinkLabel`s (`IList&lt;LinkLabel&gt;`). I later add `LinkLabel`s to this list and add those labels to a `FlowLayoutPanel` like follows:


    foreach(var s in strings)
    {
        _list.Add(new LinkLabel{Text=s});
    }

    flPanel.Controls.AddRange(_list.ToArray());

Resharper shows me a warning: `Co-variant array conversion from LinkLabel[] to Control[] can cause run-time exception on write operation`. 

Please help me to figure out:

  1. What does this means? 
  2. This is a user control and will not be accessed by multiple objects to setup labels,
     so keeping code as such will not affect it.


Co-variant array conversion from x to y may cause run-time exception

How do I limit or restrict the user to only enter a maximum of five characters in the textbox?

Below is the input field as part of my form:

    &lt;input type=&quot;text&quot; id=&quot;sessionNo&quot; name=&quot;sessionNum&quot; /&gt;

Is it using something like maxSize or something like that?

Limit number of characters allowed in form input text field

By default, `&lt;input type=&quot;search&quot; /&gt;` renders like a &quot;native&quot; search field on Mac OS X (rounded corners, clear button, etc.). I want to completely remove this custom styling so that the input looks identical to an equivalent text input (`&lt;input type=&quot;text&quot; /&gt;`), but while keeping the input type set to `search`.

I&#39;ve tried `-webkit-appearance: none;`, which gets it very close...but there&#39;s something funny going on with margins/padding that I can&#39;t seem to override, which causes the width of the search field to render ~20px shorter than a text input.

Is there another `-webkit-` specific property I&#39;m not aware of to totally disable the styling?

How do I remove all default Webkit search field styling?

Ok this is seemingly impossible to get right. I have a text box and a select box. I want them to be the same width exactly so they line up on the left margin and the right margin.

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;
    	&lt;head&gt;
    		&lt;style type=&quot;text/css&quot;&gt;
    			input, select {
    				width: 200px;
    			}
    		&lt;/style&gt;
    	&lt;/head&gt;
    	&lt;body&gt;
    		&lt;input type=&quot;text&quot; value=&quot;ABC&quot;&gt;&lt;br&gt;
    		&lt;select&gt;
    			&lt;option&gt;123&lt;/option&gt;
    		&lt;/select&gt;
    	&lt;/body&gt;
    &lt;/html&gt;

That would do it you think, right? Nope. The select box is 6px shorter in Firefox. See screenshot. ![screenshot in firefox][1]

Ok so lets edit the code and make two styles.

    &lt;style type=&quot;text/css&quot;&gt;
    	input {
    		width: 200px;
    	}
    	select {
    		width: 206px;
    	}
    &lt;/style&gt;

Ok that works!

![Fixed in Firefox][2]

Oh wait, better test in Chrome...

![chrome screenshot][3]

![FFFFFFFUUUUUUUUUUUU][4]


Can someone tell me how to line these up in all browsers? Why can&#39;t I just do width: 200px on all, why do all the browsers display it differently? Also while we&#39;re at it why is the text box and select box different heights? How do we get them to the same height? Have tried height and line-height no no avail.

------------------
Solution:
------------------
Ok I&#39;ve found the solution with some help from the answers below. The key is to use the **box-sizing: border-box** property so when you specify the width that *includes* the border and padding. See [excellent explanation here][5]. Then the browser can&#39;t stuff it up.

Code is below, have also set the height of the boxes to the same size and indented the text inside the box so it lines up. You also need to set the border as Chrome has a really weird looking border it uses for select boxes which will throw out the alignment. This will work for HTML5 sites (e.g. supporting IE9, Firefox, Chrome, Safari, Opera etc).

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;
        &lt;head&gt;
            &lt;style type=&quot;text/css&quot;&gt;
                input, select {
                    width: 200px;
    				border: 1px solid #000;
    				padding: 0;
    				margin: 0;
    				height: 22px;
    				-moz-box-sizing: border-box;
    				-webkit-box-sizing: border-box;
    				box-sizing: border-box;
                }
    			input {
    				text-indent: 4px;
    			}
            &lt;/style&gt;
        &lt;/head&gt;
        &lt;body&gt;
            &lt;input type=&quot;text&quot; value=&quot;ABC&quot;&gt;&lt;br&gt;
            &lt;select&gt;
                &lt;option&gt;123&lt;/option&gt;
                &lt;option&gt;123456789 123123123123&lt;/option&gt;
                &lt;option&gt;123456789 123123123123 134213721381212&lt;/option&gt;
            &lt;/select&gt;
        &lt;/body&gt;
    &lt;/html&gt;

Just one final warning you may not want input buttons, checkboxes etc to be included in this styling so use the `input:not([type=&#39;button&#39;])` to not apply it to certain types or use `input[type=&#39;text&#39;], input[type=&#39;password&#39;]` to specify ones you do want it to apply to.

  [1]: http://i.stack.imgur.com/pvIQi.png
  [2]: http://i.stack.imgur.com/ij6Sv.png
  [3]: http://i.stack.imgur.com/jpolD.png
  [4]: http://i.stack.imgur.com/R1BrW.png
  [5]: http://www.reddit.com/r/webdev/comments/s8u0p/wow_this_speced_behavior_was_the_source_of_so/c4c6cuy

Aligning text and select boxes to the same width in CSS?

I have a `TextBox` named `textbox1` and a `Button` named `button1`.
When I click on `button1` I want to browse my files to search only for image files (type jpg, png, bmp...).
And when I select an image file and click Ok in the file dialog I want the file directory to be written in the `textbox1.text` like this:

    textbox1.Text = &quot;C:\myfolder\myimage.jpg&quot;

Content Type	Original Author	Original Content on Stackoverflow
Question	HelpNeeder	View Question on Stackoverflow
Solution 1 - C#	Austin Salonen	View Answer on Stackoverflow
Solution 2 - C#	norlando	View Answer on Stackoverflow
Solution 3 - C#	FUSION CHA0S	View Answer on Stackoverflow
Solution 4 - C#	Ammar	View Answer on Stackoverflow

How to disable textbox from editing?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

PHPUnit best practices to organize tests

Limiting the number of characters in a string, and chopping off the rest

Attributions