TextBoxWatermark控件，该控件用于当控件处于非焦点时的提示内容。
<%...@PageLanguage="C#"AutoEventWireup="true"CodeFile="TextboxWatermarkDemo.aspx.cs"
Inherits="TextboxWatermarkDemo"%>
<%...@RegisterAssembly="System.Web.Extensions,Version=1.0.61025.0,Culture=neutral,
PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI"TagPrefix="asp"%>
<%...@RegisterAssembly="AjaxControlToolkit"Namespace="AjaxControlToolkit"TagPrefix="cc1"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>无标题页</title>
</head>
<body>
<formid="form1"runat="server">
<div>
<asp:ScriptManagerID="ScriptManager1"runat="server">
</asp:ScriptManager>
<asp:UpdatePanelID="UpdatePanel1"runat="server">
<ContentTemplate>
用户名:
<asp:TextBoxID="TextBox1"CssClass="unwatermarked"Width="150"runat="server">
</asp:TextBox>
<cc1:TextBoxWatermarkExtenderID="TextBoxWatermarkExtender1"runat="server"
TargetControlID="TextBox1"WatermarkText="请输入用户名"/>
<br/>
密码:
<asp:TextBoxID="TextBox2"CssClass="unwatermarked"Width="150"runat="server">
</asp:TextBox>
<cc1:TextBoxWatermarkExtenderID="TextBoxWatermarkExtender2"runat="server"
TargetControlID="TextBox2"WatermarkText="请输入密码"/>
<br/>
<br/>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
<%...@PageLanguage="C#"AutoEventWireup="true"CodeFile="TextboxWatermarkDemo.aspx.cs" Inherits="TextboxWatermarkDemo"%>
<%...@RegisterAssembly="System.Web.Extensions,Version=1.0.61025.0,Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI"TagPrefix="asp"%><%...@RegisterAssembly="AjaxControlToolkit"Namespace="AjaxControlToolkit"TagPrefix="cc1"%><!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml"><headrunat="server"><title>无标题页</title></head><body><formid="form1"runat="server"><div><asp:ScriptManagerID="ScriptManager1"runat="server"></asp:ScriptManager><asp:UpdatePanelID="UpdatePanel1"runat="server"><ContentTemplate>用户名:<asp:TextBoxID="TextBox1"CssClass="unwatermarked"Width="150"runat="server"></asp:TextBox>
<cc1:TextBoxWatermarkExtenderID="TextBoxWatermarkExtender1"runat="server"TargetControlID="TextBox1"WatermarkText="请输入用户名"/>
<br/>密码: <asp:TextBoxID="TextBox2"CssClass="unwatermarked"Width="150"runat="server"></asp:TextBox>
<cc1:TextBoxWatermarkExtenderID="TextBoxWatermarkExtender2"runat="server" TargetControlID="TextBox2"WatermarkText="请输入密码"/>
<br/><br/></ContentTemplate></asp:UpdatePanel></div></form></body></html>
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