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SqlRoleProvider.DeleteRole Method

Removes a role from the role database.

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

public override bool DeleteRole (
	string roleName,
	bool throwOnPopulatedRole
)
public boolean DeleteRole (
	String roleName, 
	boolean throwOnPopulatedRole
)
public override function DeleteRole (
	roleName : String, 
	throwOnPopulatedRole : boolean
) : boolean
Not applicable.

Parameters

roleName

The name of the role to delete.

throwOnPopulatedRole

If true, throws an exception if roleName has one or more members.

Return Value

true if the role was successfully deleted; otherwise, false.

Exception typeCondition

System.ArgumentNullException

roleName is a null reference (Nothing in Visual Basic) (Nothing in Visual Basic).

System.ArgumentException

roleName is an empty string or contains a comma.

-or-

roleName is longer than 256 characters.

System.Configuration.Provider.ProviderException

roleName has one or more members and throwOnPopulatedRole is true.

-or-

An unknown error occurred while communicating with the database.

The DeleteRole method is called by the Roles class to delete a role from the SQL Server database specified in the ASP.NET application's configuration file (Web.config). When a role is deleted, the list of users associated with that role is also deleted from the database. The user information in the database is not affected.

If throwOnPopulatedRole is true, then an exception will be thrown and the role will not be deleted if the role identified by the roleName parameter has one or more members. If throwOnPopulatedRole is false, then the role will be deleted whether it is empty or not.

The following example deletes a role from the database. For an example of a Web.config file that enables role management, see SqlRoleProvider.


<%@ 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">

  string[] rolesArray;

  public void Page_Load(object sender, EventArgs args)
  {
    if (!IsPostBack)
    {
      // Bind roles to ListBox.

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


  public void DeleteRole_OnClick(object sender, EventArgs args)
  {
    string delRole = "";

    try
    {
      delRole = RolesListBox.SelectedItem.Value;

      Roles.DeleteRole(delRole);

      Msg.Text = "Role '" + Server.HtmlEncode(delRole) + "' deleted.";


      // Re-bind roles to ListBox.

      rolesArray = Roles.GetAllRoles();
      RolesListBox.DataSource = rolesArray;
      RolesListBox.DataBind();
    }
    catch
    {
      Msg.Text = "Role '" + Server.HtmlEncode(delRole) + "' <u>not</u> deleted.";
    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
  <title>Sample: Delete Role</title>
</head>
<body>
  <form runat="server" id="PageForm">
    <h3>
      Delete Role</h3>
    <asp:Label ID="Msg" ForeColor="maroon" runat="server" /><br />
    <table border="0">
      <tr>
        <td valign="top">
          Delete Role:</td>
        <td valign="top">
          <asp:ListBox ID="RolesListBox" runat="server" Rows="8" /></td>
        <td valign="top">
          <asp:Button Text="Delete Role" ID="DeleteRoleButton" runat="server" OnClick="DeleteRole_OnClick" /></td>
      </tr>
    </table>
  </form>
</body>
</html>

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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