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- ASP.NET Tutorial
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ASP.NET validation controls validate the user input data to ensure that useless, unauthenticated, or contradictory data don't get stored.
ASP.NET provides the following validation controls:
- RequiredFieldValidator
- RangeValidator
- CompareValidator
- RegularExpressionValidator
- CustomValidator
- ValidationSummary
BaseValidator Class
The validation control classes are inherited from the BaseValidator class hence they inherit its properties and methods. Therefore, it would help to take a look at the properties and the methods of this base class, which are common for all the validation controls:
Members | Description |
---|---|
ControlToValidate | Indicates the input control to validate. |
Display | Indicates how the error message is shown. |
EnableClientScript | Indicates whether client side validation will take. |
Enabled | Enables or disables the validator. |
ErrorMessage | Indicates error string. |
Text | Error text to be shown if validation fails. |
IsValid | Indicates whether the value of the control is valid. |
SetFocusOnError | It indicates whether in case of an invalid control, the focus should switch to the related input control. |
ValidationGroup | The logical group of multiple validators, where this control belongs. |
Validate() | This method revalidates the control and updates the IsValid property. |
RequiredFieldValidator Control
The RequiredFieldValidator control ensures that the required field is not empty. It is generally tied to a text box to force input into the text box.
The syntax of the control is as given:
RangeValidator Control
The RangeValidator control verifies that the input value falls within a predetermined range.
It has three specific properties:
Properties | Description |
---|---|
Type | It defines the type of the data. The available values are: Currency, Date, Double, Integer, and String. |
MinimumValue | It specifies the minimum value of the range. |
MaximumValue | It specifies the maximum value of the range. |
The syntax of the control is as given:
CompareValidator Control
The CompareValidator control compares a value in one control with a fixed value or a value in another control.
It has the following specific properties:
Properties | Description |
---|---|
Type | It specifies the data type. |
ControlToCompare | It specifies the value of the input control to compare with. |
ValueToCompare | It specifies the constant value to compare with. |
Operator | It specifies the comparison operator, the available values are: Equal, NotEqual, GreaterThan, GreaterThanEqual, LessThan, LessThanEqual, and DataTypeCheck. |
The basic syntax of the control is as follows:
RegularExpressionValidator
The RegularExpressionValidator allows validating the input text by matching against a pattern of a regular expression. The regular expression is set in the ValidationExpression property.
The following table summarizes the commonly used syntax constructs for regular expressions:
Character Escapes | Description |
---|---|
b | Matches a backspace. |
t | Matches a tab. |
r | Matches a carriage return. |
v | Matches a vertical tab. |
f | Matches a form feed. |
n | Matches a new line. |
Escape character. |
Apart from single character match, a class of characters could be specified that can be matched, called the metacharacters.
Metacharacters | Description |
---|---|
. | Matches any character except n. |
[abcd] | Matches any character in the set. |
[^abcd] | Excludes any character in the set. |
[2-7a-mA-M] | Matches any character specified in the range. |
w | Matches any alphanumeric character and underscore. |
W | Matches any non-word character. |
s | Matches whitespace characters like, space, tab, new line etc. |
S | Matches any non-whitespace character. |
d | Matches any decimal character. |
D | Matches any non-decimal character. |
Quantifiers could be added to specify number of times a character could appear.
Quantifier | Description |
---|---|
* | Zero or more matches. |
+ | One or more matches. |
? | Zero or one matches. |
{N} | N matches. |
{N,} | N or more matches. |
{N,M} | Between N and M matches. |
The syntax of the control is as given:
CustomValidator
The CustomValidator control allows writing application specific custom validation routines for both the client side and the server side validation.
The client side validation is accomplished through the ClientValidationFunction property. The client side validation routine should be written in a scripting language, such as JavaScript or VBScript, which the browser can understand.
The server side validation routine must be called from the control's ServerValidate event handler. The server side validation routine should be written in any .Net language, like C# or VB.Net.
The basic syntax for the control is as given:
ValidationSummary
The ValidationSummary control does not perform any validation but shows a summary of all errors in the page. The summary displays the values of the ErrorMessage property of all validation controls that failed validation.
The following two mutually inclusive properties list out the error message:
ShowSummary : shows the error messages in specified format.
ShowMessageBox : shows the error messages in a separate window.
Free driverpack offline full. The syntax for the control is as given:
Validation Groups
Complex pages have different groups of information provided in different panels. In such situation, a need might arise for performing validation separately for separate group. This kind of situation is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their ValidationGroup property.
Example
The following example describes a form to be filled up by all the students of a school, divided into four houses, for electing the school president. Here, we use the validation controls to validate the user input.
This is the form in design view:
The content file code is as given:
The code behind the submit button:
Software Screenshots
Download and install GetMeBack Business on your Laptop or Desktop computer
Check compatible PC Apps or Alternatives
App | Download | Rating | Developer |
---|---|---|---|
getmeback business | Get App or Alternatives | 5/5 1 Reviews | Pavel Zhuravlev |
Or follow the guide below to use on PC:
If you want to install and use the GetMeBack Business app on your PC or Mac, you will need to download and install a Desktop App emulator for your computer. We have worked diligently to help you understand how to use this app for your computer in 4 simple steps below:
Step 1: Download an Android emulator for PC and Mac
Ok. First things first. If you want to use the application on your computer, first visit the Mac store or Windows AppStore and search for either the Bluestacks app or the Nox App >>. Most of the tutorials on the web recommends the Bluestacks app and I might be tempted to recommend it too, because you are more likely to easily find solutions online if you have trouble using the Bluestacks application on your computer. You can download the Bluestacks Pc or Mac software Here >>.
Step 2: Install the emulator on your PC or Mac
Now that you have downloaded the emulator of your choice, go to the Downloads folder on your computer to locate the emulator or Bluestacks application.
Once you have found it, click it to install the application or exe on your PC or Mac computer.
Now click Next to accept the license agreement.
Follow the on screen directives in order to install the application properly.
If you do the above correctly, the Emulator app will be successfully installed.
Step 3: for PC - Windows 7/8 / 8.1 / 10
Now, open the Emulator application you have installed and look for its search bar. Once you found it, type GetMeBack Business in the search bar and press Search. Click on GetMeBack Businessapplication icon. A window of GetMeBack Business on the Play Store or the app store will open and it will display the Store in your emulator application. Now, press the Install button and like on an iPhone or Android device, your application will start downloading. Now we are all done.
You will see an icon called 'All Apps'.
Click on it and it will take you to a page containing all your installed applications.
You should see the icon. Click on it and start using the application.
Step 4: for Mac OS
Hi. Mac user!
The steps to use GetMeBack Business for Mac are exactly like the ones for Windows OS above. All you need to do is install the Nox Application Emulator or Bluestack on your Macintosh. The links are provided in step one
Need help or Can't find what you need? Kindly contact us here →
GetMeBack Business On iTunes
Download | Developer | Rating | Score | Current version | Adult Ranking |
---|---|---|---|---|---|
Free On iTunes | Pavel Zhuravlev | 1 | 5 | 3.3.6 | 17+ |
Validator Nt Software Mac
Download on AndroidDownload Android
The client side validation is accomplished through the ClientValidationFunction property. The client side validation routine should be written in a scripting language, such as JavaScript or VBScript, which the browser can understand.
The server side validation routine must be called from the control's ServerValidate event handler. The server side validation routine should be written in any .Net language, like C# or VB.Net.
The basic syntax for the control is as given:
ValidationSummary
The ValidationSummary control does not perform any validation but shows a summary of all errors in the page. The summary displays the values of the ErrorMessage property of all validation controls that failed validation.
The following two mutually inclusive properties list out the error message:
ShowSummary : shows the error messages in specified format.
ShowMessageBox : shows the error messages in a separate window.
Free driverpack offline full. The syntax for the control is as given:
Validation Groups
Complex pages have different groups of information provided in different panels. In such situation, a need might arise for performing validation separately for separate group. This kind of situation is handled using validation groups.
To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their ValidationGroup property.
Example
The following example describes a form to be filled up by all the students of a school, divided into four houses, for electing the school president. Here, we use the validation controls to validate the user input.
This is the form in design view:
The content file code is as given:
The code behind the submit button:
Software Screenshots
Download and install GetMeBack Business on your Laptop or Desktop computer
Check compatible PC Apps or Alternatives
App | Download | Rating | Developer |
---|---|---|---|
getmeback business | Get App or Alternatives | 5/5 1 Reviews | Pavel Zhuravlev |
Or follow the guide below to use on PC:
If you want to install and use the GetMeBack Business app on your PC or Mac, you will need to download and install a Desktop App emulator for your computer. We have worked diligently to help you understand how to use this app for your computer in 4 simple steps below:
Step 1: Download an Android emulator for PC and Mac
Ok. First things first. If you want to use the application on your computer, first visit the Mac store or Windows AppStore and search for either the Bluestacks app or the Nox App >>. Most of the tutorials on the web recommends the Bluestacks app and I might be tempted to recommend it too, because you are more likely to easily find solutions online if you have trouble using the Bluestacks application on your computer. You can download the Bluestacks Pc or Mac software Here >>.
Step 2: Install the emulator on your PC or Mac
Now that you have downloaded the emulator of your choice, go to the Downloads folder on your computer to locate the emulator or Bluestacks application.
Once you have found it, click it to install the application or exe on your PC or Mac computer.
Now click Next to accept the license agreement.
Follow the on screen directives in order to install the application properly.
If you do the above correctly, the Emulator app will be successfully installed.
Step 3: for PC - Windows 7/8 / 8.1 / 10
Now, open the Emulator application you have installed and look for its search bar. Once you found it, type GetMeBack Business in the search bar and press Search. Click on GetMeBack Businessapplication icon. A window of GetMeBack Business on the Play Store or the app store will open and it will display the Store in your emulator application. Now, press the Install button and like on an iPhone or Android device, your application will start downloading. Now we are all done.
You will see an icon called 'All Apps'.
Click on it and it will take you to a page containing all your installed applications.
You should see the icon. Click on it and start using the application.
Step 4: for Mac OS
Hi. Mac user!
The steps to use GetMeBack Business for Mac are exactly like the ones for Windows OS above. All you need to do is install the Nox Application Emulator or Bluestack on your Macintosh. The links are provided in step one
Need help or Can't find what you need? Kindly contact us here →
GetMeBack Business On iTunes
Download | Developer | Rating | Score | Current version | Adult Ranking |
---|---|---|---|---|---|
Free On iTunes | Pavel Zhuravlev | 1 | 5 | 3.3.6 | 17+ |
Validator Nt Software Mac
Download on AndroidDownload Android
Thank you for reading this tutorial. Have a nice day!
Validator Nt Software Install
GetMeBack Business Software Features and Description
С помощью приложения GetMeBack Business вы сможете сканировать QR коды клиентов, начислять и списывать бонусные баллы клиентов, подключённых к программе лояльности GetMeBack