Imports System
Imports System.Web
Imports System.Web.UI
Namespace SimpleControlSamples
Public Class SimpleVB : Inherits Control
Protected Overrides Sub Render(Output As HtmlTextWriter)
Output.Write("<H2>欢迎使用控件开发！</H2>")
End Sub
End Class
End Namespace
引用文件Simple.aspx：
<%@ Register TagPrefix="SimpleControlSamples" Namespace="SimpleControlSamples" Assembly="SimpleControlSamplesVB" %>
<html>
<body>
<form method="POST" action="Simple.aspx" runat=server>
<SimpleControlSamples:SimpleVB id="MyControl" runat=server/>
</form>
</body>
</html>
13、如何在ASP.NET程序中发送邮件呢？
在ASP.NET程序中发送邮件不再象ASP中那样需要组件的支持了，在.NET的框架基类的System.Web.Mail名称空间内包含的MailMessage和SmtpMail类可以实现这个功能。
例如：
Dim message As new Mail.MailMessage
message.From = "web3@163.com"
message.To = "web3@163.com"
message.Subject = "测试"
message.Body = "内容"
Mail.SmtpMail.SmtpServer = "localhost"
Mail.SmtpMail.Send(message)
14、我将如何通过ADO.NET读取数据库中的图片并显示它呢？
下面举一个从Microsoft SQL Server的PUB数据库读取图片并显示它的例子：
下面举一个从Microsoft SQL Server的PUB数据库读取图片并显示它的例子：
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Import Namespace="System.IO" %>
<script language="VB" runat="server">
Sub Page_load(Sender as Object, E as EventArgs)
dim stream as new MemoryStream
dim connection as SqlConnection
connection=new SqlConnection("server=localhost;database=pubs;uid=sa;pwd=")
try
connection.Open()
dim command as SqlCommand
command = new SqlCommand ("select logo from pub_info where pub_id='0736'", connection)
dim image as byte()
image = command.ExecuteScalar ()
stream.Write (image, 0, image.Length)
dim imgbitmap as bitmap
imgbitmap = new Bitmap (stream)
Response.ContentType = "image/gif"
imgbitmap.Save (Response.OutputStream, ImageFormat.Gif)
Finally
connection.Close()
stream.Clse()
End Try
End Sub
</script>
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