Sorry, here the next:

mp_Roles_Delete

@RoleID int,

@UserRoles nvarchar(1000);

AS

DELETE FROM mp_Roles

WHERE RoleID = @RoleID
AND RoleName  <> 'Admins'
AND RoleName <> 'Content Administrators'
AND RoleName <> 'Authenticated Users'
AND RoleName <> 'Role Admins'
AND @UserRoles

3. In mojoPortal.Data.MSSQL

public static bool Delete(int roleId,string userRoles)
        {
            SqlParameterHelper sph = new SqlParameterHelper(GetConnectionString(), "mp_Roles_Delete", 1);
            sph.DefineSqlParameter("@RoleID", SqlDbType.Int, ParameterDirection.Input, roleId);
            sph.DefineSqlParameter("@userRoles", SqlDbType.NVarChar, 1000, ParameterDirection.Input, userRoles);
            int rowsAffected = sph.ExecuteNonQuery();
            return (rowsAffected > -1);
        }

Where that string can be empty or a string from the web config Key values :

( AND RoleName <> 'MyFisrstRole'
AND RoleName <> 'MySecondRole'
AND RoleName <> 'MyThirdRole' )

4:

Also In Business :
public static bool DeleteRole(int roleId,string userRoles)
  {
   return DBRoles.Delete(roleId,userRoles);
  }

5. and finally in RoleManager.aspx ;
case "delete":
                  string userRoles = string.Empty;
                    if (ConfigurationManager.AppSettings["DoNotAllowToDeleteUserRoles"] != string.Empty)
                    {
                       
                        string[] roles = (ConfigurationManager.AppSettings["DoNotAllowToDeleteUserRoles"]).Split(';');
                       
                        foreach (string r in roles)
                        {
                            userRoles += "AND RoleName <> '" + r +"'";
                        }
                    }

                    Role.DeleteRole(roleID, userRoles);

                    rolesList.EditItemIndex = -1;
                    BindRoleList();
                    break;

Thank you, Just A suggestion

Thank you Joe,

you are always step forward

I am familiar with Sql injection, but it was a try.

Thank you