Get Plain user name removing membership provider when Claims authentication is used

public string GetPlainUserName(string fullUserName)
        {
            if (!SPClaimProviderManager.IsEncodedClaim(fullUserName))
                return fullUserName;
            var claimsProviderManager = SPClaimProviderManager.Local;

            return claimsProviderManager.DecodeClaim(fullUserName).Value;
        }