How to get html textbox value in ASP.Net

In this blog post, you will learn about to get the value of input javascript and how to get Html textbox value in ASP.Net C# code behind aspx.cs page. Keep reading on How to get client IP address using JavaScript in Html, How to read and display RSS feed in ASP.NET C#.

There are two ways we can access the HTML TextBox value in aspx code-behind:-

Using Request Form collection and name property.
Using runat = “server” property.

How to get Html textbox value in ASP.Net C#

The HTML <input> element is used to create interactive controls for web-based forms in order to accept data from the user. To get the value of textbox in javascript from Html the tag should have an attribute called [NAME]. Find the below source code:-

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>get value of input javascript</title>
</head>
<body>
    <form id="form1" runat="server">
        <h2>How to get html textbox value in asp.net</h2>
        <div>
            <input type="text" placeholder="First Name" name="_firstname" /><br />
            <input type="text" placeholder="Last Name" name="_lastname" /><br />
            <br />
            <asp:Button ID="btnShow" runat="server" Text="Show" OnClick="btnShow_Click" />

            <br />
            <br />
            <asp:Label ID="result" ForeColor="Red" runat="server"></asp:Label>
        </div>
    </form>
</body>
</html>

Default.aspx.cs

using System;
using System.Web.UI;
public partial class index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnShow_Click(object sender, EventArgs e)
    {
        string firstName = Page.Request.Form["_firstname"].ToString();
        string lastname = Page.Request.Form["_lastname"].ToString();
        result.Text = firstName + " " + lastname;
    }
}

Download Source Code

Conclusion

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