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AddUserToRole Method

Roles.AddUserToRole Method

Adds the specified user to the specified role.

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)

public static void AddUserToRole(
	string username,
	string roleName
)

Parameters

username
Type: System.String

The user name to add to the specified role.

roleName
Type: System.String

The role to add the specified user name to.

ExceptionCondition
System.ArgumentNullException

roleName is null.

-or-

username is null.

System.ArgumentException

roleName is an empty string or contains a comma (,).

-or-

username is an empty string or contains a comma (,).

System.Configuration.Provider.ProviderException

Role management is not enabled.

-or-

User is already assigned to the specified role.

The AddUserToRole method calls the default role provider to associate the specified user with the specified role at the data source.

NoteNote

User names and role names cannot contain commas.

The following code example adds a user to a role. For an example of a Web.config file that enables role management, see Roles.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.UI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

string[] rolesArray;
MembershipUserCollection users;

public void Page_Load()
{
  Msg.Text = "";

  if (!IsPostBack)
  {
    // Bind roles to ListBox.

    rolesArray = Roles.GetAllRoles();
    RolesListBox.DataSource = rolesArray;
    RolesListBox.DataBind();

    // Bind users to ListBox.

    users = Membership.GetAllUsers();
    UsersListBox.DataSource = users;
    UsersListBox.DataBind();
  }
}


public void AddUser_OnClick(object sender, EventArgs args)
{
  // Verify that a user and a role are selected.

  if (UsersListBox.SelectedItem == null)
  {
    Msg.Text = "Please select a user.";
    return;
  } 

  if (RolesListBox.SelectedItem == null)
  {
    Msg.Text = "Please select a role.";
    return;
  }

  // Add the user to the selected role.

  try
  {
    Roles.AddUserToRole(UsersListBox.SelectedItem.Value, RolesListBox.SelectedItem.Value);  
    Msg.Text = "User added to Role.";
  }
  catch (HttpException e)
  {
    Msg.Text = e.Message;
  } 
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Role Membership</title>
</head>
<body>

<form runat="server" id="PageForm">
  <h3>Role Membership</h3>
  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
  <table cellpadding="3" border="0">
    <tr>
      <td valign="top">Roles:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" runat="server" Rows="8" /></td>
      <td valign="top">Users:</td>
      <td valign="top"><asp:ListBox id="UsersListBox" DataTextField="Username" 
                                  Rows="8" runat="server" /></td>
      <td valign="top"><asp:Button Text="Add User to Role" id="AddUserButton"
                                 runat="server" OnClick="AddUser_OnClick" /></td>
    </tr>
  </table>
</form>

</body>
</html>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Show:
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