Add Roles to a user using Object model

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SharePoint;
namespace AddRoleOM_CS
{
class Program
{
private struct roleData
{
public string SiteUr;
public string WebName;
public string RoleName;
public string RoleDescription;
public SPBasePermissions PermissionMask;
}
static public void Main()
{
//Step 1: Prompt data needed to define
// the new role
roleData r = GetParams();
try
{
//Step 2: Get handle to specific site collection and web site
SPSite site = new SPSite(r.SiteUr);
SPWeb web = site.AllWebs[r.WebName];
web.AllowUnsafeUpdates = true;
//Step 3: Get collection of current role definitions for site
SPRoleDefinitionCollection roles = web.RoleDefinitions;
//Step 4: Create a new role using information passed in
SPRoleDefinition role = new SPRoleDefinition();
role.Name = r.RoleName;
role.Description = r.RoleDescription;
role.BasePermissions = r.PermissionMask;
roles.Add(role);
//Step 5: Display success message
Console.WriteLine(
"Role '" + r.RoleName + "' has been successfully added");
web.Dispose();
site.Dispose();
}
catch (Exception ex)
{
//Step 6: If error occurred, display error message
Console.WriteLine(ex.Message);
}
Console.WriteLine();
Console.WriteLine("Press any key to continue...");
Console.Read();
}
static private roleData GetParams()
{
roleData r = new roleData();
try
{
// Get the basic data
Console.WriteLine();
Console.Write("Site collection url: ");
r.SiteUr = Console.ReadLine();
Console.Write("Site (web): ");
r.WebName = Console.ReadLine();
Console.Write("Role to add: ");
r.RoleName = Console.ReadLine();
Console.Write("Description of role: ");
r.RoleDescription = Console.ReadLine();
// Now get a character that represents the
// set of permissions the new role should
// inherit
Console.Write(
"Role (F=Full Control, C=Contribute, R=Read): ");
string strBasePermission = Console.ReadLine();
//Only allow user to enter valid permission character,
//keep looping until valid response provided
SPSite site = new SPSite(r.SiteUr);
SPWeb web = site.AllWebs[r.WebName];
r.PermissionMask = SPBasePermissions.EmptyMask;
while (true)
{
switch (strBasePermission.ToUpper())
{
case "F":
r.PermissionMask =
web.RoleDefinitions["Full Control"].BasePermissions;
break;
case "C":
r.PermissionMask =
web.RoleDefinitions["Contribute"].BasePermissions;
break;
case "R":
r.PermissionMask =
web.RoleDefinitions["Read"].BasePermissions;
break;
}
if (r.PermissionMask != SPBasePermissions.EmptyMask)
break;
else
{
Console.Write("Your selection was not valid" +
" (F=Full Control, C=Contribute, R=Read): ");
strBasePermission = Console.ReadLine();
}
}
Console.WriteLine();
Console.WriteLine();
web.Dispose();
site.Dispose();
}
catch (Exception ex)
{
// If an error occurred, display the error message
Console.WriteLine();
Console.WriteLine(ex.Message);
Console.WriteLine();
}
return r;
}
}
}