C# - Find Out User Belongs To Which Groups

I have a windows user accounts which i just created take XYZ for example.

This XYZ belongs to a User group and a custom group i created in Computer Management --> Local users and groups.

So in properties i see that the user belongs to the 2 groups.

Now i want to get those groups and display them. any suggestions???

i have done this but this is not right as it gives me the roles of SQL (i think)

here is what i did:

after logging in and impersonating i call the function

getUserGroups();

private void getUserGroups()
{
// collect the user domain and identity
string[] arr =
System.Web.HttpContext.Current.Request.
LogonUserIdentity.Name.Split('\');
// update the display to show
// the captured domain and user
if (arr.Length > 0)
{
new GUIUtility().LogMessageToFile("User Name" + arr[0].ToString());
new GUIUtility().LogMessageToFile("User Domain" + arr[1].ToString());
}
// create an arraylist and populate
// it with the list of groups that
// the current user belongs to
ArrayList al = new ArrayList();
al = GetGroups();
// check to see if the user belongs
// to a specific group and create
// a list of all of the user's groups
foreach (string s in al)
{
// add this one to the list
new GUIUtility().LogMessageToFile("Group" + s);
// check to see if the user
// belongs to a specific group
//if (s == "BXSWLT\SomeCustomGroup")
//{
// // change the label to show
// // there was a match
// lblMemberOfGroup.Text = "YES";
//}
}
}
public ArrayList GetGroups()
{
ArrayList groups = new ArrayList();
foreach (System.Security.Principal.IdentityReference group in
System.Web.HttpContext.Current.Request.LogonUserIdentity.Groups)
{
groups.Add(group.Translate(typeof
(System.Security.Principal.NTAccount)).ToString());
}
return groups;
}

the Result i get is:

9/8/2010 5:57:22 PM: User Name NT AUTHORITY.
9/8/2010 5:57:22 PM: User Domain IUSR.
9/8/2010 5:57:22 PM: Group Everyone.
9/8/2010 5:57:22 PM: Group BUILTINUsers.
9/8/2010 5:57:22 PM: Group NT AUTHORITYAuthenticated Users.
9/8/2010 5:57:22 PM: Group NT AUTHORITYThis Organization.
9/8/2010 5:57:22 PM: Group LOCAL.