Aspx CodeBehind can't get Text from Textbox

Question

I am new to asp. I am using Visual Studio 2015 Community. I created a new Website over "File>New>Website>Website for AspWebForms "

Now my problem is I am writing now in CodeBehind, in my About.aspx.cs. If I try to get text from a asp Textbox over tb_bezeichnung.Text it says it's not in context.

So after long search I figured out that i need a Designer.cs, I cant recreate it or have any options to Convert to WebForm.

<%@ Page Title="About" Language="C#" MasterPageFile="~/MasterPage.Master"
         AutoEventWireup="true" CodeFile="About.aspx.cs" Inherits="About" %>

tb_bezeichnung is a Asp Textbox.

Project Explorer contents:

About.aspx

About.aspx.cs

Answer 1

If I understand correctly, you want to take the value of your textbox, after let's say a button click for an example? Just create a Button and OnClick event and let's say add an Label in the design view, in the OnClick Method write:

in aspx file add:

<asp:Button ID="Button1" runat="server" Text="Click me !"  OnClick="Button1_Click" />    
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

Code behind:

  protected void Button1_Click(object sender, EventArgs e)

    {
        Label1.Text = TextBox1.Text;           
    }

Answer 2

Sounds like you've started with a "Web Site" instead of a "Web Application". A Web Site type uses older technology and is more difficult to maintain, I recommend starting over with a Web Application, which creates the designer files automatically. See Here..

ASP.NET Web Site or ASP.NET Web Application?