Hello
Check below code, asp.net allow to check password strenth
<asp:TextBox ID="TextBox2" runat="server"
TextMode="Password">
</asp:TextBox>
<asp:PasswordStrength ID="PasswordStrength2"
runat="server"
TargetControlID="TextBox2"
RequiresUpperAndLowerCaseCharacters="true"
MinimumNumericCharacters="1"
MinimumSymbolCharacters="1"
MinimumUpperCaseCharacters="1"
PreferredPasswordLength="8"
DisplayPosition="RightSide"
StrengthIndicatorType="BarIndicator"
BarBorderCssClass="BarBorder"
StrengthStyles="BarIndicatorweak;BarIndicatoraverage;BarIndicatorgood;">
</asp:PasswordStrength>
let me know if any problem
Thanks
Gaurav Dhol