Set the `CausesValidation` property to false.

    &lt;asp:Button runat=&quot;Server&quot; ... CausesValidation=&quot;False&quot; /&gt;

[Button.CausesValidation](http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.causesvalidation.aspx) (If I remember correctly).

Try putting `CausesValidation=&quot;false&quot;` as a button attribute.

Some sample code:

http://weblogs.asp.net/scottgu/archive/2005/08/04/421647.aspx

&gt;**ASPX Page:**

    &lt;asp:Button ID=&quot;buttonNew&quot; runat=&quot;server&quot; Text=&quot;New&quot; CausesValidation=&quot;False&quot; /&gt;
**OR**

&gt;**CodeBehind Page: (.cs)**

    buttonNew.CausesValidation = false;

Check [here][1] to know more about `Validated` and `Validating` events for the controls.


  [1]: https://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating(v=vs.100).aspx

Set the button.causesValidation to false.

[this link][1]

However, if all it is doing is calculating something based on user input then you shouldn&#39;t have it posting back at all. I would recommend using an HTML button and attach some javascript to it to do your work for you and then you won&#39;t have this problem.


  [1]: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.causesvalidation.aspx

While designing the button, you can set its property CausesValidation=&quot;false&quot; to avoid validation on button click event. It does not allow to validation the server control and perform its click event only

You should use this

 `UseSubmitBehavior=&quot;False&quot;`

To disable validation in a specific control

Set the control&#39;s CausesValidation property to false.


    &lt;asp:Button id=&quot;Button3&quot; runat=&quot;server&quot;
      Text=&quot;Cancel&quot; CausesValidation=&quot;False&quot;&gt;
    &lt;/asp:Button&gt;

To disable a validation control

    Set the validation controls Enabled property to false.

To disable client-side validation

    Set the validation controls EnableClientScript property to false.


[For More Info][1] 


  [1]: https://msdn.microsoft.com/en-us/library/bt244wbb.aspx?cs-save-lang=1&amp;cs-lang=vb#code-snippet-1

I am trying to get client ip address using 

        HttpContext.Request.UserHostAddress;


but it returns `::1`.

How to solve this?

Request.UserHostAddress issue with return result &quot;::1&quot;

Let&#39;s say I want to set the **svn:ignore** property for directory **dir1** with multiple values, *file1*, *file2*, and *file3*.
How can I do this via command line, without using a text editor (to set the property value)?


How to set svn:ignore with multiple values?

I have an ASP.NET form that takes input from a user. There&#39;s a `Submit` button on the form and a button called `Calc` which does a calculation to populate a text field. The problem I&#39;m having is that on the form I have a set of `&lt;ASP:REQUIREDFIELDVALIDATOR&gt;` validators and when the `Calc` button is pressed the form gets validated. I don&#39;t want the required fields to be validated when the `Calc` button is pressed, only the `Submit` button. Any way around this?

How to bypass validation for a button in ASP.NET?

<p>I have an ASP.NET form that takes input from a user. There's a <code>Submit</code> button on the form and a button called <code>Calc</code> which does a calculation to populate a text field. The problem I'm having is that on the form I have a set of <code>&#x3C;ASP:REQUIREDFIELDVALIDATOR></code> validators and when the <code>Calc</code> button is pressed the form gets validated. I don't want the required fields to be validated when the <code>Calc</code> button is pressed, only the <code>Submit</code> button. Any way around this?</p>


In a big project I work for, I am considering recommending other programmers to always seal their classes if they haven&#39;t considered how their classes should be subclassed. Often times, less-experienced programmers never consider this.

I find it odd that in Java and C# classes are non-sealed / non-final by default. I think making classes sealed greatly improves readability of the code.

Notice that this is in-house code that we can always change should the rare case occur that we need to subclass.



What are your experiences? I meet quite some resistance to this idea. Are people that lazy they could not be bothered to type `sealed`?

Should I recommend sealing classes by default?

I need to make sure that a process is running before moving on with a method.

The statement is:

    Process.Start(&quot;popup.exe&quot;);

Can you do a WAIT command or set a delay on this value?

C# - Making a Process.Start wait until the process has start-up

How can I delete a file in C# e.g. `C:\test.txt`, although apply the same kind of method like in batch files e.g.

    if exist &quot;C:\test.txt&quot;
    
    delete &quot;C:\test.txt&quot;
    
    else 
    
    return nothing (ignore)

How to delete a file after checking whether it exists

Could someone show how it is possible to check whether another instance of the program (e.g. test.exe) is running and if so stop the application from loading if there is an existing instance of it.

How to check if another instance of the application is running

I want to display a color based on a value from 0 to 100. At one end (100), it&#39;s pure Red, the other end (0), pure Green. In the middle (50), I want it to be yellow.

And I want the colors to fade gradually from one to another, such that at 75, the color is half red and half yellow, etc.

How do I program the RGB values to reflect this fading? Thanks.

Algorithm: How do I fade from Red to Green via Yellow using RGB values?

I have one DataTable which has four columns such as

     StudentID        CourseID          SubjectCode            Marks    
    ------------     ----------        -------------          --------
        1               100              MT400                  80
        2               100              MT400                  79
        3               100              MT400                  88

Here I am inserting this Datatable into the Sql server table by passing this datatable as an XML Table.

I just want to Change the DataTable Column Name &quot;Marks&quot; as &quot;SubjectMarks&quot; and pass this DataTable as an XML Table.

I know how to pass the DataTable as an XML Table. But I dont know, How to change the DataTable Column Name &quot;Marks&quot; as &quot;SubjectMarks&quot;.

How to change the DataTable Column Name?

ASP.NET offers two ways to specify paths for style sheets:

```
&lt;link href=&quot;/common/black_theme/css/style.css&quot; rel=&quot;stylesheet&quot;&gt;   (this is working)
&lt;link href=&quot;~/common/black_theme/css/style.css&quot; rel=&quot;stylesheet&quot;&gt;  (this is not working)
```

- How are these paths resolved?
- Why are the generated paths different?
- Which one should I pick in which case?

As per my knowledge, `~` represents the root directory of the application.
&quot;common&quot; is the folder below the website root (named `testsite.demo`) in IIS.

Physical path: `D:\Physicalpath\WarpFirstSite\testsite.demo`&lt;br&gt;
&quot;common&quot; folder: `D:\Physicalpath\WarpFirstSite\testsite.demo\common`





Slash (/) vs tilde slash (~/) in style sheet path

I have One DataTable with 5 Columns and 10 Rows.
     Now I want to add one New Column to the DataTable and I want to assign DropDownList value to the New Column.
     So the DropDownList value should be added 10 times to the New Column.
     How to do this?
Note: Without using FOR LOOP.

For Example: My Existing DataTable is like this.

       ID             Value
      -----          -------
        1              100
        2              150

Now I want to add one New Column &quot;CourseID&quot; to this DataTable.
I have One DropDownList. Its selected value is 1.
So My Existing Table should be like below:

        ID              Value         CourseID
       -----            ------       ----------
        1                100             1
        2                150             1
How to do this?

How to add New Column with Value to the Existing DataTable?

Can someone explain in less than 2 sentences the difference between both? Yes, I know google can provide hundreds of answers but not one in 2 clear sentences:)


HTTP handler vs HTTP module

Any ideas what this problem is? cheers

![enter image description here][1]


  [1]: http://i.stack.imgur.com/8XSEN.png

The relative virtual path &#39;&#39; is not allowed here

Why is the following code valid when I am using a `&lt;div&gt;` inside a `&lt;li&gt;`?

    &lt;ul&gt;
        &lt;li class=&quot;aschild&quot;&gt;
            &lt;div class=&quot;nav&quot;&gt;Test&lt;/div&gt;
        &lt;/li&gt;
    &lt;/ul&gt;

Can I use a div inside a list item?

Is there any way to get facebook&#39;s crappy Open Graph meta tags to validate if my doctype is `&lt;!DOCTYPE html&gt;` (HTML5)?

Other than facebook&#39;s Open Graph meta tags, my document validates perfectly.

I really don&#39;t want to use `&lt;!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML+RDFa 1.0//EN&quot; &quot;http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd&quot;&gt;` as that creates a whole new set of problems.

Here is an example of one of the validation errors in question...

Error Line 11, Column 47: Attribute property not allowed on element meta at this point.

    &lt;meta property=&quot;og:type&quot; content=&quot;website&quot; /&gt;

Any help would be appreciated... I have been searching off and on for days to no avail.

Open Graph validation for HTML5

I&#39;m running into a behavior I wasn&#39;t expecting when using Enum.TryParse.

If I have an enum:

    public enum MyEnum
    {
      ValueA,
      ValueB,
      ValueC
    }

And then I pass a numeric value (as a string) into Enum.TryParse, like:

    MyEnum outputEnum;
    bool result = Enum.TryParse(&quot;1234&quot;, out outputEnum);

Despite the string &quot;1234&quot; not being a possible value, result will come back as true, and my outputEnum will have a value of 1234. 

Is there a way I can avoid this sort of behavior? I&#39;m trying to write a function which will process arbitrary string input as an enum, and this has thrown a bit of a monkeywrench in my bad-input detection.

Enum.TryParse returns true for any numeric values

I have a curious problem with ASP.NET MVC3 client-side validation. I have the following class:

    public class Instrument : BaseObject
    {
        public int Id { get; set; }

        [Required(ErrorMessage = &quot;Name is required.&quot;)]
        [MaxLength(40, ErrorMessage = &quot;Name cannot be longer than 40 characters.&quot;)]
        public string Name { get; set; }
    }

From my view:

    &lt;div class=&quot;editor-field&quot;&gt;
        @Html.EditorFor(model =&gt; model.Name)
        @Html.ValidationMessageFor(model =&gt; model.Name)
    &lt;/div&gt;


And here&#39;s the generated HTML I get for the textbox for this field:

    &lt;input class=&quot;text-box single-line&quot; data-val=&quot;true&quot; data-val-required=&quot;Name is required.&quot; id=&quot;Name&quot; name=&quot;Name&quot; type=&quot;text&quot; value=&quot;&quot;&gt;

No sign of the `MaxLengthAttribute`, but everything else seems to be working.

Any ideas what&#39;s going wrong?


MaxLength Attribute not generating client-side validation attributes

I have an input that can have only 2 values `apple` or `banana`. What regular expression can I use to ensure that either of the two words was submitted?

Content Type	Original Author	Original Content on Stackoverflow
Question	Mark Allison	View Question on Stackoverflow
Solution 1 - C#	Brandon	View Answer on Stackoverflow
Solution 2 - C#	Brad Christie	View Answer on Stackoverflow
Solution 3 - C#	IrishChieftain	View Answer on Stackoverflow
Solution 4 - C#	Bharath theorare	View Answer on Stackoverflow
Solution 5 - C#	MoarCodePlz	View Answer on Stackoverflow
Solution 6 - C#	Krishnakumar	View Answer on Stackoverflow
Solution 7 - C#	Oscar Perez	View Answer on Stackoverflow
Solution 8 - C#	DJN	View Answer on Stackoverflow

How to bypass validation for a button in ASP.NET?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Solution 5 - C#

Solution 6 - C#

Solution 7 - C#

Solution 8 - C#

How to set svn:ignore with multiple values?

Request.UserHostAddress issue with return result "::1"

Attributions