Finding Logged in user /Domain using System.Security

To find the Domain name using System.Security.Principal.WindowsIdentity

#C Code:-

 //Get the access if the username exists in the group 

     private bool GetUserInfo()

        {

            bool isAccess = false;

            ClsMailParameters.UsrSourceKey = Environment.UserName;

            if (CheckIdentity() == true)

            {

                isAccess = true;

            }

            return isAccess;

        }

// function for check the user exists in the group or not

//If exists return true otherwise false

private bool CheckIdentity()

        {

            bool bIsGroupie = false;

            System.Security.Principal.WindowsIdentity identity = System.Security.Principal.WindowsIdentity.GetCurrent();

            var sourceKey = identity.Name.ToString();

            // get a list of group names for the user

            ArrayList groups2 = new ArrayList();

            foreach (System.Security.Principal.IdentityReference group in identity.Groups)

            {

                groups2.Add(group.Translate(typeof(System.Security.Principal.NTAccount)).ToString());

            }

            for (int i = 0; i < groups2.Count; i++)

            {

                var ii = groups2[i].ToString();

                string checkValue = "GroupName"; // Give the group name

                try

                {

                    if (ii.ToUpper() == checkValue.ToUpper())

                    {

                        bIsGroupie = true;

                        break;

                    }

                }

                catch { }

            }

            return bIsGroupie;

        }