convert <img> html tag to plain text

public static string StripTagsCharArray(string source)
        {
            char[] array = new char[source.Length];
            int arrayIndex = 0;
            bool inside = false;
            for (int i = 0; i < source.Length; i++)
            {
                char let = source[i];
                if (let == '<')
                {
                    inside = true; continue;
                }
                if (let == '>')
                {
                    inside = false; continue;
                }
                if (!inside)
                {
                    array[arrayIndex] = let; arrayIndex++;
                }
            }
            return new string(array, 0, arrayIndex);
        }

string convertedString = StripTagsCharArray(strHTML); //strHTML is your string with HTML