ASP。net中如何改变HTML控件背景色和BODY背景色

初学ASP。net写了如下成程序，希望改变Wed背景色和上的的文本框（HTML控件和WEB控件）背景色，结果发现WED控件可以改变，
但文档和HTML控件的背景出错，请指教。附源码如下：（VS2003开发）
webform1.aspx.vb
Imports System.Drawing.Color

Public Class WebForm1
    Inherits System.Web.UI.Page

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Text1.BackColor = Red
        Lbl.BackColor = Wheat
        txt2.bgcolor = "#ff0000"
        mybody.BgColor="#ff0000"
    End Sub
End Class

-----------------webform1.aspx-----------------------------------
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="WebtestColor.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body id="mybody" runat="server">
<form id="Form1" method="post" runat="server">
<asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 224px; POSITION: absolute; TOP: 176px" runat="server"
Text="Button"></asp:Button>
<asp:TextBox id="Text1" style="Z-INDEX: 102; LEFT: 208px; POSITION: absolute; TOP: 104px" runat="server"
Height="56px" BackColor="#C0C0FF"></asp:TextBox>
<asp:Label id="Lbl" style="Z-INDEX: 103; LEFT: 208px; POSITION: absolute; TOP: 64px" runat="server"
BackColor="#80FF80" Width="136px">Label</asp:Label>
<INPUT type="text" id="txt2" name="txt2" runat="server">
</form>
</body>
</HTML>

8 个解决方案

#1

Input控件没有bgcolor这个属性使用style控制。

#2

txt2.Style["background-color"] = "#ff0000" ;
mybody.Style["background-color"]="#ff0000" ;

#3

button1.Attributes.Add("onclick","javascript:body.bgcolor=#####");

#4

用Css控制..

#5

showWin说的
txt2.Style["background-color"] = "#ff0000" ;
mybody.Style["background-color"]="#ff0000" ;

可以改变文本控件的背景，但mybody不行，程序提示mybody未声明，但我确实在<body id="mybody" runat="server" >定义了呀。

#6

在html中加入runat="server"一样在后台调用

#7

(Page.FindControl("mybody") as System.Web.UI.HtmlControls.HtmlGenericControl).Style["background-color"]="#ff0000" ;

#8

在不使用代码隐藏时，我可以用如下代码改变网页的背景色。
<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="gb2312" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script runat="server" language="vb">
sub btnClick(o as object,e as eventargs)
b.attributes.add("bgcolor","red")
end sub
</script>
</head>
<body id="b" runat="server">
<form runat="server">
<asp:Button ID="btn" runat="server" Text="test" OnClick="btnClick" />
</form>
</body>
</html>

在使用代码隐藏时，出错提示：对非共享成员的引用要求对象引用
代码面如下
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        B.Attributes.Add("bgcolor", "red")

    End Sub

#1