一个简单的ASP.NET进度条控件：

（1）创建 一个ID="Button1"的BUTTON控件 和 一个ID="LAY1"的DIV控件

<asp:Button ID="Button1" runat="server" Text="Button" /><br />
        <DIV >
        <FONT face="宋体"></FONT><FONT face="宋体"></FONT><FONT face="宋体"></FONT><FONT face="宋体"></FONT><br>
        <b><font color="#800080" size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;正在检索数据，请稍候...</font></b>
        <table align="center" style="width: 78px; height: 25px">
             <tr>
                 <td style="width: 56px; height: 27px;">
                     <div style="BORDER-RIGHT: black 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: black 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 8pt; PADDING-BOTTOM: 2px; BORDER-LEFT: black 1px solid; PADDING-TOP: 2px; BORDER-BOTTOM: black 1px solid; width: 88px;" >
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                            <span >&nbsp;</span>
                      </div>
                  </td>
              </tr>
          </table>
      </Div>

（2）写javascript脚本

<script language="javascript" type='text/javascript'>

    var progressEnd = 15;  // set to number of progress <span>'s.
    var progressColor = 'green'; // set to progress bar color
    var progressInterval = 300; // set to time between updates (milli-seconds)
    var progressAt = progressEnd;
    var progressTimer;
//Button1的onClick事件 触发 progress_update()
function progress_update()
{
     progressAt++;
     if (progressAt > progressEnd)
     {
        progress_clear();
        progressAt=1;
     }
     document.getElementById('progress'+progressAt).style.backgroundColor = progressColor;
     progressTimer = setTimeout('progress_update()',progressInterval);
}
//Button1的onClick事件即将完成 触发 progress_stop()
function progress_stop()
{
     clearTimeout(progressTimer);
     progress_clear();
}
function progress_clear()
{
    for (var i = 1; i <= progressEnd; i++) document.getElementById('progress'+i).style.backgroundColor = 'transparent';
    progressAt = 0;
}
</script>

（3）编写后台代码

'页面初始化时 为按钮绑定状态与事件
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Me.IsPostBack Then
            Button1.Attributes.Add("onClick", "Lay1.style.visibility='';progress_update();")
        End If
    End Sub

 '设置按钮的属性
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        MsgBox("here it is")
        Me.scriptjdt(Me, "Lay1.style.visibility='hidder';progress_stop();")
    End Sub

 '通过 Me.ClientScript.RegisterStartupScript 注册javascript脚本
    Public Sub scriptjdt(ByVal objPage As System.Web.UI.Page, ByVal strValue As String)
        Dim jb As String
        jb = "<script language='javascript' type='text/javascript'>" + strValue + "</script>"
        objPage.ClientScript.RegisterStartupScript(Me.GetType(), "jdt_ok", jb)

        ‘objPage.RegisterStartupScript("jdt_ok", jb)
    End Sub