A page can have only one server-side Form tag in ASP.net

I'm new to ASP.net and I'm trying to run the following ASP.net code, but it's giving me an error : A page can have only one server-side Form tag .

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="FirstWebsite._Default" %>


<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
   <form id="form1" runat="server">
<div>
    <asp:Label runat="server" id="HelloWorldLabel"></asp:Label>
    <br /><br />
    <开发者_运维百科;asp:TextBox runat="server" id="TextInput" /> 
    <asp:Button runat="server" id="GreetButton" text="Say Hello!" />
</div>
</form>
</asp:Content>

Could anyone please tell me what's wrong I'm doing?

Your Masterpage probably has a Form tag as well.

If you want to do multiple Form tags, remove the runat="server" attribute and use plain HTML input tags instead.

You are using the master page and the master page would have the form tag. So remove it from this page.

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="FirstWebsite._Default" %>


<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<div>
    <asp:Label runat="server" id="HelloWorldLabel"></asp:Label>
    <br /><br />
    <asp:TextBox runat="server" id="TextInput" /> 
    <asp:Button runat="server" id="GreetButton" text="Say Hello!" />
</div>
</asp:Content>