Validation controls ASP .NET

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baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
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VALIDATION CONTROLS IN .NET
ARJUN S R
Arjun.sr007@gmail.com
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ryavartham
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07
9745649882

• A validation control (or validator) determines whether the
data in another web control is in the proper format, before the
data is processed.
• When the XHTML for our page is created, the validator is
converted into JavaScript that performs the validation
• JavaScript is a scripting language that enhances the
functionality and appearance of web pages and is typically
executed on the client.
• Because some clients disable or do not support scripting,
ASP.NET validation controls can function on the client,
on the server or both.

WHAT VALIDATION CONTROLS
DO?
• Rich, declarative validation
• Validation declared separately from input control
• Extensible validation framework
• Supports validation on client and server
• Server-side validation is always done
– Prevents users from spoofing Web Forms
• Validate User inputs
75% of code for handling exceptions
Simplify task

1. RequiredFieldValidator
 Ensures that a value is entered
• <asp: RequiredFieldValidator
2. CompareValidator
– Compares input to: data type, constant, another control,
database value, etc
– <asp: CompareValidator>
3. RangeValidator
– Entry within a specified data range
– <asp: RangeValidator>
4. ValidationSummary
– Summarizes all errors on page
– <asp: ValidationSummary>

4. RegularExpressionValidator
– Check format against a specific pattern
– E-mail address, phone number, zip code, etc
– <asp: RegularExpressionValidator>
5. CustomValidator
– Write own code
– Server- or client-side
– <asp: CustomValidator>

• Validation controls are derived from
System.Web.UI.WebControls.BaseValidator, which is derived
from the Label control
• Validation controls contain text which is displayed only if validation fails
• Text property is displayed at control location
• ErrorMessage is displayed in summary
• Page.IsValid indicates if all validation controls on the page succeed
void Submit_click(object s, EventArgs e) {
if (Page.IsValid) {
Message. Text = "Page is valid!";
}
}

RequiredFieldValidator
<asp: RequiredFieldValidator id=”reqFirstName”
ControlToValidate=”txtFirstName” Text=”(Required)”
SetFocusOnError=”true” Runat=”server” />

CompareValidator
<asp: CompareValidator id=”cmpBirthDate” Text=”(Invalid Date)”
ControlToValidate=”txtBirthDate” Type=”Date”
Operator=”DataTypeCheck” Runat=”server” />

RangeValidator
<asp: RangeValidator id=”reqAge” ControlToValidate=”txtAge”
Text=”(Invalid Age)” MinimumValue=”5” MaximumValue=”100”
Type=”Integer” Runat=”server” />

ValidationSummary
<asp: ValidationSummary id=”ValidationSummary1” ShowMessageBox=”true”
ShowSummary=”false” Runat=”server” />

RegularExpressionValidator
• <asp: RegularExpressionValidator id=”regEmail”
ControlToValidate=”txtEmail” Text=”(Invalid email)”
ValidationExpression=”w+([-+.’]w+)*@w+([-.]w+)*.w+([-.]w+)*”
Runat=”server” />

CustomValidator
• <asp: CustomValidator id=”valComments”
ControlToValidate=”txtComments”
Text=”(Comments must be less than 10 characters)”
OnServerValidate=”valComments_ServerValidate”
Runat=”server” />

BENEFITS AND LIMITATIONS
Benefits
– Convenience
• Cut & paste
– Bomb-proof
• Server-side validation
Limitations
– Must remember to check on server
• Page.IsValid statement
– Different interpretations of regular expressions
• JavaScript vs. server
• minor issue

SUMMARY
• Easy to use
• Flexible
– Validate any type of input
• Combines client- and server-side validation in one
control
• Bomb-proof server-side validation

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Validation controls ASP .NET

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