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Webpages Forms in ASP

Webpages Forms in ASP

Absolutely! Here’s a straightforward guide on handling forms in ASP.NET Web Pages (WebMatrix) — covering form creation, submission, retrieving data, validation, and more.


Working with Forms in ASP.NET Web Pages


1. Creating a Basic HTML Form

<form method="post">    Name: <input type="text" name="name" />    Email: <input type="email" name="email" />    <input type="submit" value="Submit" /></form>

2. Handling Form Submission and Retrieving Data

@{    if (IsPost) {        var name = Request.Form["name"];        var email = Request.Form["email"];    }}

3. Display Submitted Data

@if (IsPost) {    <p>You submitted: Name = @Request.Form["name"], Email = @Request.Form["email"]</p>}

4. Simple Validation Example

@{    var error = "";    if (IsPost) {        var name = Request.Form["name"];        var email = Request.Form["email"];        if (String.IsNullOrWhiteSpace(name) || String.IsNullOrWhiteSpace(email)) {            error = "Both Name and Email are required.";        } else {            <p>Thank you, @name!</p>;        }    }}<form method="post">    Name: <input type="text" name="name" value="@Request.Form["name"]" />    Email: <input type="email" name="email" value="@Request.Form["email"]" />    <input type="submit" value="Submit" /></form>@if (!String.IsNullOrEmpty(error)) {    <p style="color:red;">@error</p>}

5. Using Request.QueryString for GET Forms

@{    var search = Request.QueryString["search"];}<form method="get">    Search: <input type="text" name="search" value="@search" />    <input type="submit" value="Search" /></form>@if (!String.IsNullOrEmpty(search)) {    <p>You searched for: @search</p>}

6. File Upload Form

<form method="post" enctype="multipart/form-data">    Select file: <input type="file" name="fileUpload" />    <input type="submit" value="Upload" /></form>@{    if (IsPost) {        var file = Request.Files["fileUpload"];        if (file != null && file.ContentLength > 0) {            var savePath = Server.MapPath("~/uploads/" + file.FileName);            file.SaveAs(savePath);            <p>File uploaded successfully: @file.FileName</p>;        } else {            <p>No file selected.</p>;        }    }}

Summary

TaskCode / Concept
Create formUse <form method="post"> or method="get"
Access form dataUse Request.Form["fieldname"]
Validate inputCheck for empty or invalid values
Retain form valuesSet input value to @Request.Form["field"]
File uploadUse enctype="multipart/form-data" and Request.Files

If you want me to help with multi-step forms, CSRF protection, or advanced validation, just say!

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