功能：
验证密码强度 。 用来提示用户输入密码的强度,用户在密码框中输入密码时,在文本框的后面会有一个提示,显示密码的强度 。
重要属性：
TargetControlID : 密码框ID
DisplayPosition : 提示信息显示的位置，一共有6个值。
分别是：RightSide、 AboveRight 、AboveLeft、 LeftSide、 BelowRight 、BelowLeft 。
StrengthIndicatorType : 设置显示的方式,文本或是进度条 。分别为:Text和BarIndicator。
PreferredPasswordLength : 密码强度最好时的长度
PrefixText : 在文本对密码强度描述的前缀
TextStrengthDescriptions : 在文本框中对密码的强度描述
TextCssClass : 文本提示时的样式
MinimumNumericCharacters : 密码中至少要包含的数字的个数
MinimumSymbolCharacters : 密码中至少要包含特殊字符的个数
BarIndicatorCssClass : 提示进度条的样式
BarBorderCssClass : 提示进度条的边框样式
RequiresUpperAndLowerCaseCharacters : 是否需要区分大小写
实例代码如下：
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title> <link href="StyleSheet.css" rel="stylesheet" type="text/css" /></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <br /> Text Indicators<br /> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <br /> <asp:Label ID="Label1" runat="server" Width="153px"></asp:Label><br /> <br /> Status Bar Indicators<br /> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br /> <asp:Label ID="Label2" runat="server" Width="154px"></asp:Label><br /> <br /> Help Indicators<br /> <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><br /> <asp:Label ID="Label3" runat="server" Width="154px"></asp:Label><br /> <br /> <br /> <ajaxToolkit:PasswordStrength ID="PasswordStrength1" runat="server" TargetControlID="TextBox1" DisplayPosition="RightSide" StrengthIndicatorType="Text" PreferredPasswordLength="10" PrefixText="Strength:" TextStrengthDescriptions="Very Poor;Weak;Average;Strong;Excellent" MinimumNumericCharacters="0" MinimumSymbolCharacters="0" HelpStatusLabelID="Label1" TextCssClass="TextIndicator_TextBox1" RequiresUpperAndLowerCaseCharacters="false"> </ajaxToolkit:PasswordStrength> <ajaxToolkit:PasswordStrength ID="PasswordStrength2" runat="server" TargetControlID="TextBox2" DisplayPosition="RightSide" StrengthIndicatorType="BarIndicator" BarIndicatorCssClass="BarIndicator_TextBox2" BarBorderCssClass="BarBorder_TextBox2" PreferredPasswordLength="10" PrefixText="Strength:" TextStrengthDescriptions="Very Poor;Weak;Average;Strong;Excellent" MinimumNumericCharacters="1" MinimumSymbolCharacters="1" HelpStatusLabelID="Label2" RequiresUpperAndLowerCaseCharacters="true"> </ajaxToolkit:PasswordStrength> <ajaxToolkit:PasswordStrength ID="PasswordStrength3" runat="server" TargetControlID="TextBox3" TextCssClass="TextIndicator_TextBox3" DisplayPosition="RightSide" StrengthIndicatorType="Text" PreferredPasswordLength="20" PrefixText="Meets Polixy : " MinimumNumericCharacters="2" MinimumSymbolCharacters="2" HelpStatusLabelID="Label3" HelpHandleCssClass="TextIndicator_TextBox3_Handle" HelpHandlePosition="BelowRight" TextStrengthDescriptions="Not at all; Very Low Compliance; Low Compliance; Average Compliance; Good Compliance; High Compliance; Yes" RequiresUpperAndLowerCaseCharacters="true" > </ajaxToolkit:PasswordStrength> </div> </form> </body></html>
相应的CSS如下：
.TextIndicator_TextBox1 {
}
background-color:Gray; color:White; font-family:Arial; font-size:x-small; font-style:italic; padding: 2px 3px 2px 3px; 
}.BarIndicator_TextBox2 { color:Blue; background-color:Blue; padding-bottom:0px; }.BarBorder_TextBox2 { border-style:solid; border-width:1px; width:200px; vertical-align:middle; }.TextIndicator_TextBox3 { background-color:Blue; color:Yellow; font-size:small; font-variant:small-caps; padding: 2px 3px 2px 3px; }运行结果如下：
图1.文本提示
图2.进度条提示
