本文介绍了一个使用ASP.NET实现的简单图片上传和检索应用。该应用通过C#语言及HTML构建用户界面，并利用SqlDataSource组件连接数据库进行图片数据的存储与读取。用户可以上传图片、选择已存储的图片或删除图片。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PageImageSQL.aspx.cs" Inherits="PageImageSQL" %>
<!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 id="Head1" runat="server">
<title>存储并检索图片</title>
<style type="text/css">
.style2
{
height: 64px;
}
.style4
{
height: 64px;
width: 405px;
}
.style5
{
width: 405px;
}
.style6
{
}
</style>
</head>
<body>
<form id="form1" runat="server" enctype="multipart/form-data">
<div style="text-align:center">
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<table style="width: 48%;">
<tr>
<td class="style5">
<asp:FileUpload
ID="fileUpload" runat="server" style="margin-left: 0px" Width="300px"
Font-Size="Medium" AccessKey="U" Font-Bold="True"
ToolTip="上传图片(Alt+U)" />
</td>
<td class="style6" rowspan="2">
<asp:Button ID="btnUpLoad" runat="server" OnClick="btnUpLoad_Click" Text="上传(L)"
Height="32px" Font-Size="Medium" Width="100px" AccessKey="L" Font-Bold="True"
ToolTip="快捷键(Alt+L)" />
<br />
<asp:Button ID="btnDelete" runat="server" OnClick="btnDelete_Click" Text="删除(D)"
Height="32px" Font-Size="Medium" Width="100px" AccessKey="D" Font-Bold="True"
ToolTip="快捷键(Alt+D)" Enabled="False" />
<br />
<asp:Button ID="btnSelect" runat="server" onclick="btnSelect_Click" Text="查询(S)"
Width="100px" AccessKey="S" Font-Bold="True" Font-Size="Medium"
Height="32px" ToolTip="快捷键(Alt+S)" Enabled="False" />
</td>
</tr>
<tr>
<td class="style4">
<asp:DropDownList ID="dropDownListName" runat="server" Font-Size="Medium"
Height="66px" style="margin-bottom: 0px" Width="300px" AccessKey="N"
ToolTip="快捷键(Alt+N)">
</asp:DropDownList>
</td>
</tr>
</table>
<asp:SqlDataSource ID="sqlDSImage" runat="server"
ConnectionString="<%$ ConnectionStrings:SqlImage %>"
ProviderName="<%$ ConnectionStrings:SqlImage.ProviderName %>"
oninserting="sqlDSImage_Inserting">
</asp:SqlDataSource>
<br />
</div>
</form>
</body>
</html>
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