1. .NET Validation Controls
MIS Professor Sandvig
7/24/2019
.NET Validation Controls

2. MIS 324 -- Professor Sandvig
7/24/2019
Today
What Validation controls do
Benefits & Limitations
Six Validation Controls
Implementation Example

3. What Validation Controls Do
MIS Professor Sandvig
7/24/2019
What Validation Controls Do
Each control:
Validates user inputs on client-side using JavaScript
When possible
Validates all inputs on server
Writes client-side error message if invalid

4. Benefits and Limitations
MIS Professor Sandvig
7/24/2019
Benefits and Limitations
Benefits
Convenience
Cut & paste
Bomb-proof
Server-side validation
Limitations
Must remember to check on server
Page.IsValid statement

5. Six Validation Controls
MIS Professor Sandvig
7/24/2019
Six Validation Controls
RequiredFieldValidator
Only validator that checks for NO entry
CompareValidator
Compares input to: datatype, constant, another control, database value, etc.
RangeValidator
Entry within a specified data range

6. Six Validation Controls
MIS Professor Sandvig
7/24/2019
Six Validation Controls
RegularExpressionValidator
Check format against a specific pattern
address, phone number, zip code, etc.
CustomValidator
Write own code
Server- or client-side
ValidationSummary
Summarizes all errors on page

7. MIS 324 -- Professor Sandvig
7/24/2019
Implementation
Often need > 1 validator per input
Only RequiredFieldValidator checks for empty fields
Page.IsValid
Check in event handler
if (!Page.IsValid) return;
Validation Groups
Allow validation controls to be assigned to groups
Page can have several groups
Act independently
Only group associated with postback event must have valid entries
Example: No groups, groups
Example:
Required, Compare, Range, & Custom (client- and server-side script)
Validation.aspx (source)

8. MIS 324 -- Professor Sandvig
7/24/2019
Summary
Easy to use
Flexible
Validate any type of input
Combines client- and server-side validation in one control
Bomb-proof server-side validation