.NET Development - Class 20 | MVC Form Validation, Error Messages & Custom Validation in ASP.NET

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📌 Topics Covered in This Session:

MVC Validation from Scratch
✅ Creating an ASP.NET MVC Project for Validation Demo
✅ Defining a Product Model with Fields: Name, SKU, Description, Price, Email
✅ Binding Model Fields to HTML Form Inputs in the View
✅ Using Html.TextBoxFor and Html.ValidationMessageFor for Field Binding and Error Display

Form Submission Handling
✅ Creating POST Action Method in Controller to Handle Form Submission
✅ Using ModelState.IsValid to Check for Validation Errors
✅ Clearing Form After Successful Submission Using ModelState.Clear()
✅ Displaying Success Message Using ViewData After Valid Submission

Data Annotations for Server-Side Validation
✅ Using [Required], [EmailAddress], [Range] Attributes
✅ Customizing Error Messages for Validation Attributes
✅ Displaying Errors Using Html.ValidationMessageFor and Html.ValidationSummary

Creating Custom Validation in MVC
✅ Creating a Custom Validation Class by Inheriting ValidationAttribute
✅ Overriding the IsValid() Method to Add Custom Logic
✅ Example: Description Field Must Contain the Word "Hello"
✅ Using Custom Validation as an Attribute in the Model
✅ Debugging Custom Validation to Check Logic

User Interface Enhancements
✅ Styling Validation Messages in Red for Better Visibility
✅ Adding Success Notification Box When Form is Submitted Successfully

Hands-On Form Validation Example Includes:
🔹 Displaying Required Field Errors
🔹 Adding Email Field with Format Validation
🔹 Implementing Summary View for All Errors at Once
🔹 Showing Custom Message After Insert ("Record Inserted Successfully")

Upcoming Topics:
🔹 Building a Complete MVC Project with Master Page, Partial Views & Database Integration
🔹 Deploying the Application on IIS Server
🔹 MVC Design Best Practices for Enterprise Projects

🚀 Stay Tuned for More Sessions on:
🔹 Full Stack Development with ASP.NET MVC
🔹 API Development with ASP.NET Core
🔹 Advanced Form Handling & Business Logic in .NET

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