<table cellpadding="2" cellspacing="2" width="450px">
    <tr>
        <td>
            <div class="subsectionTitle">Current Roles</div>
            <p></p>
            Select roles to be deleted
            <br />
            <asp:CheckBoxList ID="chklRoles" runat="server" />
            <br />
            <asp:Button ID="btnDeleteRoles" runat="server" Text="Delete Roles" OnClick="btnDeleteRoles_Click" 
                OnClientClick="if (confirm('Are you sure you want to delete this role?\n\nIf this role is deleted, users in this role will be defaulted to basic users.') == false) return false" />
            <br />
            <asp:Label ID="lblDeleteRoles" runat="server" />
        </td>
    </tr>
    <tr>
        <td>
            <br />
        </td>
    </tr>
    <tr>
        <td class="left">
            Create New Role:
            <br />
            <asp:TextBox ID="txtNewRole" runat="server" />
            <p></p>
            <asp:Button ID="btnCreateRole" runat="server" Text="Create Role" ValidationGroup="newRole" OnClick="btnCreateRole_Click" />                            
        </td>
    </tr>
    <tr>
        <td>
            <asp:RequiredFieldValidator ID="RequiredFieldValidatorNewRole" runat="server" ControlToValidate="txtNewRole" SetFocusOnError="true"
             ErrorMessage="Role name is required" ValidationGroup="newRole" Display="dynamic">*</asp:RequiredFieldValidator>    
            <asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowMessageBox="false" ShowSummary="true" ValidationGroup="newRole" />
        </td>
    </tr>
    <tr>
        <td class="left">            
            <asp:Label ID="lblFeedbackOK" runat="server" Text="New role successfully created" SkinID="FeedbackOK" />
            <asp:Label ID="lblFeedbackKO" runat="server" SkinID="FeedbackKO" />
        </td>
    </tr>    
</table>

using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Admin_manageRoles : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
        lblFeedbackOK.Visible = false;

        if (!IsPostBack)
        {
            BindRoles();
        }
  }

    protected void btnDeleteRoles_Click(object sender, EventArgs e)
    {
        // Get roles to delete from the chklRoles
        foreach (ListItem item in chklRoles.Items)
        {
            if (item.Selected)
            {
                if (item.Text == "User" || item.Text == "Admin")
                {
                    lblDeleteRoles.Text = "The roles 'Admin' and 'User' can not be deleted, they are required for the site.";
                    lblDeleteRoles.ForeColor = Color.Red;
                    lblDeleteRoles.Visible = true;
                    break;
                }
                else
                {
                    // For each role in the list get the usrs in that role
                    string[] usersInRole = Roles.GetUsersInRole(item.Text);

                    // For each user, remove the user from the current loop's role, then add the user back into 
                    // the 'User'(default) role, if not already a member. 
                    foreach (string user in usersInRole)
                    {
                        Roles.RemoveUserFromRole(user, item.Text);

                        if (!Roles.IsUserInRole(user, "User"))
                        {
                            Roles.AddUserToRole(user, "User");
                        }
                    }
                }

                // Once all the users have been removed from the current loop's role, remove the role.
                Roles.DeleteRole(item.Text);
            }
        }

        BindRoles();
    }

    protected void btnCreateRole_Click(object sender, EventArgs e)
    {
        if (!Roles.RoleExists(txtNewRole.Text.Trim()))
        {
            Roles.CreateRole(txtNewRole.Text.Trim());
            BindRoles();
            txtNewRole.Text = "";
        }
        else
        {
            lblFeedbackKO.Text = "The role '" + txtNewRole.Text.Trim() + "' already exists. It can not be created twice.";
            lblFeedbackKO.Visible = true;
            txtNewRole.Text = "";
        }
    }

    private void BindRoles()
    {
        List<string> lstRoles = new List<string>();

        foreach (string item in Roles.GetAllRoles())
        {
            lstRoles.Add(item.ToString());
        }

        chklRoles.DataSource = lstRoles;
        chklRoles.DataBind();
    }
}