Membership.ValidateUser(String, String) Method
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Verifies that the supplied user name and password are valid.
public:
static bool ValidateUser(System::String ^ username, System::String ^ password);
public static bool ValidateUser (string username, string password);
static member ValidateUser : string * string -> bool
Public Shared Function ValidateUser (username As String, password As String) As Boolean
- username
- String
The name of the user to be validated.
- password
- String
The password for the specified user.
true
if the supplied user name and password are valid; otherwise, false
.
The following code example shows the login page for an ASP.NET application configured to use forms authentication and the Membership class. If the supplied user credentials are invalid, a message is displayed to the user. Otherwise, the user is redirected to the originally requested URL by the RedirectFromLoginPage method.
Important
This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
public void Login_OnClick(object sender, EventArgs args)
{
if (Membership.ValidateUser(UsernameTextbox.Text, PasswordTextbox.Text))
FormsAuthentication.RedirectFromLoginPage(UsernameTextbox.Text, NotPublicCheckBox.Checked);
else
Msg.Text = "Login failed. Please check your user name and password and try again.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Login</title>
</head>
<body>
<form id="form1" runat="server">
<h3>Login</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
Username: <asp:Textbox id="UsernameTextbox" runat="server" /><br />
Password: <asp:Textbox id="PasswordTextbox" runat="server" TextMode="Password" /><br />
<asp:Button id="LoginButton" Text="Login" OnClick="Login_OnClick" runat="server" />
<asp:CheckBox id="NotPublicCheckBox" runat="server" />
Check here if this is <span style="text-decoration:underline">not</span> a public computer.
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Public Sub Login_OnClick(sender As Object, args As EventArgs)
If (Membership.ValidateUser(UsernameTextbox.Text, PasswordTextbox.Text)) Then
FormsAuthentication.RedirectFromLoginPage(UsernameTextbox.Text, NotPublicCheckBox.Checked)
Else
Msg.Text = "Login failed. Please check your user name and password and try again."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Login</title>
</head>
<body>
<form id="form1" runat="server">
<h3>Login</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
Username: <asp:Textbox id="UsernameTextbox" runat="server" /><br />
Password: <asp:Textbox id="PasswordTextbox" runat="server" TextMode="Password" /><br />
<asp:Button id="LoginButton" Text="Login" OnClick="Login_OnClick" runat="server" />
<asp:CheckBox id="NotPublicCheckBox" runat="server" />
Check here if this is <span style="text-decoration:underline">not</span> a public computer.
</form>
</body>
</html>
ValidateUser provides an easy way to verify a user name and password from the data source. Note that, if the username
parameter is empty or null
, an HttpException is thrown.
Product | Versions |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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