System.Security.SecurityElement.AddAttributeSafe C# (CSharp) Method

        internal void AddAttributeSafe(string name, string value)
        {
            if (_attributes == null)
            {
                _attributes = new ArrayList(AttributesTypical);
            }
            else
            {
                int iMax = _attributes.Count;
                Debug.Assert(iMax % 2 == 0, "Odd number of strings means the attr/value pairs were not added correctly");

                for (int i = 0; i < iMax; i += 2)
                {
                    string strAttrName = (string)_attributes[i];

                    if (string.Equals(strAttrName, name))
                        throw new ArgumentException(SR.Argument_AttributeNamesMustBeUnique);
                }
            }

            _attributes.Add(name);
            _attributes.Add(value);
        }