Read image from string which is type of Application/Octet-stream

I have a base64 string which is provided below. I guess its type is Application/Octet-stream. I am using code below to convert it to an image. But it gives me error "Paramter is not valid!".

using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(base64string)))
{
    pictureEdit1.Image = Image.FromStream(ms, true);
}

string base64string = "AAAAAQEAAAEcEgABHxIAASASAAEiEgABIxIAASQSAAEmEgABKBIAASsSAAEsEgABLRIAAS4SAAEvEgABMBIAATESAAEyEgABPBIAAT4SAAFAEgABGRMAARoTAAEbEwABHBMAAR0TAAEeEwABHxMAASATAAEiEwABIxMAASQTAAElEwABJhMAAScTAAEoEwABKRMAASoTAAErEwABLBMAAS0TAAEuEwABLxMAATATAAExEwABMhMAATMTAAE0EwABNRMAATYTAAE4EwABORMAAToTAAE7EwABPBMAAUATAAFDEwABWBMAAR4UAAEiFAABIxQAASQUAAElFAABJhQAAScUAAEoFAABKRQAASoUAAErFAABLBQAAS0UAAEuFAABLxQAATAUAAExFAABMhQAATMUAAE0FAABNRQAATgUAAE5FAABOxQAARwVAAEdFQABHhUAAR8VAAEgFQABIRUAASIVAAEjFQABJBUAASUVAAEmFQABJxUAASgVAAEpFQABKhUAASsVAAEsFQABLRUAAS4VAAEvFQABMBUAATEVAAEyFQABMxUAATQVAAE1FQABNhUAATcVAAE4FQABORUAAToVAAE7FQABPBUAAT0VAAE+FQABQBUAAUIVAAFDFQABRRUAAbUVAAEQFgABGRYAARoWAAEbFgABHBYAAR0WAAEfFgABIBYAASEWAAEiFgABIxYAASQWAAElFgABJhYAAScWAAEoFgABKRYAASoWAAErFgABLBYAAS0WAAEuFgABLxYAATAWAAExFgABMhYAATMWAAE0FgABNRYAATYWAAE3FgABOBYAATkWAAE6FgABOxYAATwWAAE+FgABPxYAAUAWAAFCFgABSBYAAR8XAAEgFwABIhcAASMXAAEkFwABJRcAASYXAAEnFwABKBcAASkXAAEqFwABKxcAASwXAAEtFwABLhcAAS8XAAEwFwABMRcAATIXAAEzFwABNBcAATUXAAE2FwABOBcAATkXAAE6FwABPhcAAT8XAAEcGAABHhgAAR8YAAEgGAABIRgAASIYAAEjGAABJBgAASUYAAEmGAABJxgAASgYAAEpGAABKhgAASsYAAEsGAABLRgAAS4YAAEvGAABMBgAATEYAAEyGAABMxgAATQYAAE1GAABNhgAATcYAAE4GAABORgAAToYAAE7GAABPBgAAT0YAAE+GAABPxgAAUIYAAFbGAABkhgAAQ8ZAAEcGQABHRkAAR4ZAAEfGQABIBkAASEZAAEiGQABIxkAASQZAAElGQABJhkAAScZAAEoGQABKRkAASoZAAErGQABLBkAAS0ZAAEuGQABLxkAATAZAAExGQABMhkAATMZAAE0GQABNRkAATYZAAE3GQABOBkAATkZAAE6GQABOxkAATwZAAE9GQABPhkAAT8ZAAFAGQABQRkAAUIZAAFDGQABRRkAAUYZAAEeGgABHxoAASAaAAEhGgABIhoAASMaAAEkGgABJRoAASYaAAEnGgABKBoAASkaAAEqGgABKxoAASwaAAEtGgABLhoAAS8aAAEwGgABMRoAATIaAAEzGgABNBoAATUaAAE2GgABNxoAATgaAAE5GgABOhoAATsaAAE8GgABPRoAAT4aAAE/GgABQBoAAUEaAAFFGgABGxsAARwbAAEdGwABHhsAAR8bAAEgGwABIRsAASIbAAEjGwABJBsAASUbAAEmGwABJxsAASgbAAEpGwABKhsAASsbAAEsGwABLRsAAS4bAAEvGwABMBsAATEbAAEyGwABMxsAATQbAAE1GwABNhsAATcbAAE4GwABORsAATobAAE7GwABPBsAAT0bAAE+GwABPxsAAUAbAAFBGwABQhsAAUMbAAFFGwABThsAARUcAAEZHAABGxwAARwcAAEeHAABHxwAASAcAAEhHAABIhwAASMcAAEkHAABJRwAASYcAAEnHAABKBwAASkcAAEqHAABKxwAASwcAAEtHAABLhwAAS8cAAEwHAABMRwAATIcAAEzHAABNBwAATUcAAE2HAABNxwAATgcAAE5HAABOhwAATscAAE8HAABPRwAAT4cAAE/HAABQhwAAUMcAAFEHAABRRwAAUYcAAFHHAABSBwAAUkcAAFOHAABHx0AASAdAAEhHQABIh0AASMdAAEkHQABJR0AASYdAAEnHQABKB0AASkdAAEqHQABKx0AASwdAAEtHQABLh0AAS8dAAEwHQABMR0AATIdAAEzHQABNB0AATUdAAE2HQABNx0AATgdAAE5HQABOh0AATsdAAE8HQABPR0AAT4dAAE/HQABQh0AAUMdAAFEHQABRR0AAUgdAAEYHgABHB4AAR4eAAEfHgABIB4AASEeAAEiHgABIx4AASQeAAElHgABJh4AASceAAEoHgABKR4AASoeAAErHgABLB4AAS0eAAEuHgABLx4AATAeAAExHgABMh4AATMeAAE0HgABNR4AATYeAAE3HgABOB4AATkeAAE6HgABOx4AATweAAE9HgABPh4AAT8eAAFAHgABQR4AAUIeAAFDHgABRB4AAUUeAAFGHgABRx4AAUgeAAFMHgABGR8AARwfAAEdHwABHx8AASAfAAEhHwABIh8AASMfAAEkHwABJR8AASYfAAEnHwABKB8AASkfAAEqHwABKx8AASwfAAEtHwABLh8AAS8fAAEwHwABMR8AATIfAAEzHwABNB8AATUfAAE2HwABNx8AATgfAAE5HwABOh8AATsfAAE8HwABPR8AAT4fAAE/HwABQB8AAUEfAAFCHwABQx8AAUQfAAFFHwABRh8AAUcfAAFIHwABTh8AARwgAAEdIAABHiAAAR8gAAEgIAABISAAASIgAAEjIAABJCAAASUgAAEmIAABJyAAASggAAEpIAABKiAAASsgAAEsIAABLSAAAS4gAAEvIAABMCAAATEgAAEyIAABMyAAATQgAAE1IAABNiAAATcgAAE4IAABOSAAATogAAE7IAABPCAAAT0gAAE+IAABPyAAAUAgAAFBIAABQiAAAUMgAAFEIAABRSAAAUYgAAFHIAABSCAAAU4gAAFQIAAB7yAAAR4hAAEfIQABICEAASEhAAEiIQABIyEAASQhAAElIQABJiEAASchAAEoIQABKSEAASohAAErIQABLCEAAS0hAAEuIQABLyEAATAhAAExIQABMiEAATMhAAE0IQABNSEAATYhAAE3IQABOCEAATkhAAE6IQABOyEAATwhAAE9IQABPiEAAT8hAAFAIQABQSEAAUIhAAFDIQABRCEAAUUhAAFGIQABRyEAAUghAAFOIQABHCIAAR4iAAEfIgABICIAASEiAAEiIgABIyIAASQiAAElIgABJiIAASciAAEoIgABKSIAASoiAAErIgABLCIAAS0iAAEuIgABLyIAATAiAAExIgABMiIAATMiAAE0IgABNSIAATYiAAE3IgABOCIAATkiAAE6IgABOyIAATwiAAE9IgABPiIAAT8iAAFAIgABQSIAAUIiAAFDIgABRCIAAUUiAAFGIgABRyIAAUgiAAFJIgABTCIAAU4iAAFPIgABUCIAAVEiAAFSIgABWCIAAX8iAAEZIwABGiMAARwjAAEdIwABHiMAAR8jAAEgIwABISMAASIjAAEjIwABJCMAASUjAAEmIwABJyMAASgjAAEpIwABKiMAASsjAAEsIwABLSMAAS4jAAEvIwABMCMAATEjAAEyIwABMyMAATQjAAE1IwABNiMAATcjAAE4IwABOSMAATojAAE7IwABPCMAAT0jAAE+IwABPyMAAUAjAAFBIwABQiMAAUMjAAFEIwABRSMAAUYjAAFHIwABSCMAAUsjAAFOIwABUiMAAVUjAAH/IwABHiQAAR8kAAEgJAABISQAASIkAAEjJAABJCQAASUkAAEmJAABJyQAASgkAAEpJAABKiQAASskAAEsJAABLSQAAS4kAAEvJAABMCQAATEkAAEyJAABMyQAATQkAAE1JAABNiQAATckAAE4JAABOSQAATokAAE7JAABPCQAAT0kAAE+JAABPyQAAUAkAAFBJAABQiQAAUMkAAFEJAABRSQAAUskAAFOJAABUiQAARwlAAEeJQABHyUAASAlAAEhJQABIiUAASMlAAEkJQABJSUAASYlAAEnJQABKCUAASklAAEqJQABKyUAASwlAAEtJQABLiUAAS8lAAEwJQABMSUAATIlAAEzJQABNCUAATUlAAE2JQABNyUAATglAAE5JQABOiUAATslAAE8JQABPSUAAT4lAAE/JQABQCUAAUElAAFCJQABQyUAAUQlAAFFJQABRiUAAUclAAFJJQABSiUAAUslAAFOJQABWCUAAR4mAAEfJgABICYAASEmAAEiJgABIyYAASQmAAElJgABJiYAAScmAAEoJgABKSYAASomAAErJgABLCYAAS0mAAEuJgABLyYAATAmAAExJgABMiYAATMmAAE0JgABNSYAATYmAAE3JgABOCYAATkmAAE6JgABOyYAATwmAAE9JgABPiYAAT8mAAFAJgABQSYAAUImAAFDJgABRCYAAUUmAAFGJgABRyYAAUgmAAFLJgABTCYAAU4mAAEeJwABHycAASAnAAEhJwABIicAASMnAAEkJwABJScAASYnAAEnJwABKCcAASknAAEqJwABKycAASwnAAEtJwABLicAAS8nAAEwJwABMScAATInAAEzJwABNCcAATUnAAE2JwABNycAATgnAAE5JwABOicAATsnAAE8JwABPScAAT4nAAE/JwABQCcAAUEnAAFCJwABQycAAUQnAAFFJwABRicAAUcnAAFIJwABSycAAR4oAAEfKAABICgAASEoAAEiKAABIygAASQoAAElKAABJigAAScoAAEoKAABKSgAASooAAErKAABLCgAAS0oAAEuKAABLygAATAoAAExKAABMigAATMoAAE0KAABNSgAATYoAAE3KAABOCgAATkoAAE6KAABOygAATwoAAE9KAABPigAAT8oAAFAKAABQSgAAUIoAAFDKAABRSgAAUYoAAFHKAABTCgAARspAAEcKQABHykAASApAAEhKQABIikAASMpAAEkKQABJSkAASYpAAEnKQABKCkAASkpAAEqKQABKykAASwpAAEtKQABLikAAS8pAAEwKQABMSkAATIpAAEzKQABNCkAATUpAAE2KQABNykAATgpAAE5KQABOikAATspAAE8KQABPSkAAT4pAAE/KQABQCkAAUEpAAFCKQABRSkAAUYpAAFJKQABSikAAU4pAAEfKgABICoAASIqAAEjKgABJCoAASUqAAEmKgABJyoAASgqAAEpKgABKioAASsqAAEsKgABLSoAAS4qAAEvKgABMCoAATEqAAEyKgABMyoAATQqAAE1KgABNioAATcqAAE4KgABOSoAAToqAAE7KgABPCoAAT0qAAE+KgABPyoAAUAqAAFBKgABHisAAR8rAAEgKwABISsAASIrAAEjKwABJCsAASUrAAEmKwABJysAASgrAAEpKwABKisAASsrAAEsKwABLSsAAS4rAAEvKwABMCsAATErAAEyKwABMysAATQrAAE1KwABNisAATcrAAE4KwABOSsAATorAAE7KwABPCsAAT0rAAE+KwABPysAAUArAAFDKwABRCsAAUUrAAFPKwABGSwAAR8sAAEgLAABIiwAASMsAAEkLAABJSwAASYsAAEnLAABKCwAASksAAEqLAABKywAASwsAAEtLAABLiwAAS8sAAEwLAABMSwAATIsAAEzLAABNCwAATUsAAE2LAABNywAATgsAAE5LAABOiwAATssAAE8LAABPSwAAT4sAAE/LAABQCwAAUEsAAFCLAABQywAAUQsAAFILAABSSwAAR8tAAEiLQABIy0AASQtAAElLQABJi0AASctAAEoLQABKS0AASotAAErLQABLC0AAS0tAAEuLQABLy0AATAtAAExLQABMi0AATMtAAE0LQABNS0AATYtAAE3LQABOC0AATktAAE6LQABOy0AATwtAAE9LQABPi0AAT8tAAFCLQABQy0AAR4uAAEfLgABIC4AASIuAAEjLgABJC4AASUuAAEmLgABJy4AASguAAEpLgABKi4AASsuAAEsLgABLS4AAS4uAAEvLgABMC4AATEuAAEyLgABMy4AATQuAAE1LgABNi4AATcuAAE4LgABOS4AATouAAE7LgABPC4AAT0uAAE+LgABPy4AAUAuAAFBLgABQi4AAUMuAAFFLgABSC4AAUsuAAFMLgABUC4AARwvAAEfLwABIC8AASIvAAEjLwABJC8AASUvAAEmLwABJy8AASgvAAEpLwABKi8AASsvAAEsLwABLS8AAS4vAAEvLwABMC8AATEvAAEyLwABMy8AATQvAAE1LwABNi8AATcvAAE4LwABOS8AATovAAE7LwABPC8AAT0vAAE+LwABPy8AAUAvAAFBLwABQi8AAUMvAAFFLwABRi8AAUcvAAFOLwABWS8AAVwvAAHFLwABHjAAASIwAAEjMAABJDAAASUwAAEmMAABJzAAASgwAAEpMAABKjAAASswAAEsMAABLTAAAS4wAAEvMAABMDAAATEwAAEyMAABMzAAATQwAAE1MAABNjAAATcwAAE4MAABOTAAATowAAE7MAABPDAAAT0wAAE+MAABPzAAAUAwAAFBMAABQjAAAUMwAAFEMAABRTAAAUYwAAFIMAABSTAAAUowAAFLMAABTDAAAU0wAAEjMQABJTEAASYxAAEnMQABKDEAASkxAAEqMQABKzEAASwxAAEtMQABLjEAAS8xAAEwMQABMTEAATIxAAEzMQABNDEAATUxAAE2MQABNzEAATgxAAE5MQABOjEAATsxAAE8MQABPTEAAT4xAAE/MQABQDEAAUExAAFCMQABQzEAAUQxAAFFMQABSDEAARgyAAEfMgABIDIAASIyAAEjMgABJDIAASUyAAEmMgABJzIAASgyAAEpMgABKjIAASsyAAEsMgABLTIAAS4yAAEvMgABMDIAATEyAAEyMgABMzIAATQyAAE1MgABNjIAATcyAAE4MgABOTIAAToyAAE7MgABPDIAAT0yAAE+MgABPzIAAUAyAAFBMgABQjIAAUMyAAFEMgABRTIAAUYyAAFHMgABSDIAAUsyAAEZMwABGzMAAR4zAAEfMwABIDMAASIzAAEjMwABJDMAASUzAAEmMwABJzMAASgzAAEpMwABKjMAASszAAEsMwABLTMAAS4zAAEvMwABMDMAATEzAAEyMwABMzMAATQzAAE1MwABNjMAATczAAE4MwABOTMAATozAAE7MwABPDMAAT0zAAE+MwABPzMAAUAzAAFBMwABQjMAAUMzAAFEMwABRTMAAUYzAAFIMwABUDMAAVgzAAFfMwABGzQAASI0AAEjNAABJDQAASU0AAEmNAABJzQAASg0AAEpNAABKzQAASw0AAEtNAABLjQAAS80AAEwNAABMTQAATI0AAEzNAABNDQAATU0AAE2NAABNzQAATg0AAE5NAABOjQAATs0AAE8NAABPTQAAT40AAE/NAABQjQAAUM0AAFENAABSDQAAR81AAElNQABJjUAASc1AAEoNQABKTUAASo1AAErNQABLDUAAS01AAEuNQABLzUAATA1AAExNQABMjUAATM1AAE0NQABNTUAATY1AAE3NQABODUAATk1AAE6NQABOzUAATw1AAE9NQABPjUAAT81AAFANQABQTUAAUI1AAFDNQABRDUAAUY1AAFHNQABSTUAAUs1AAEjNgABJDYAASU2AAEmNgABKDYAASk2AAEqNgABKzYAASw2AAEtNgABLjYAAS82AAEwNgABMTYAATI2AAEzNgABNDYAATU2AAE2NgABNzYAATg2AAE5NgABOjYAATs2AAE8NgABPTYAAT42AAE/NgABQDYAAUM2AAFENgABRTYAAUY2AAFJNgAB4jYAASU3AAEpNwABKjcAASs3AAEsNwABLjcAAS83AAEwNwABMTcAATI3AAEzNwABNDcAATU3AAE2NwABNzcAATg3AAE5NwABOjcAATs3AAE8NwABPTcAAT43AAE/NwABQzcAAR84AAEgOAABIzgAASQ4AAElOAABJjgAASg4AAEpOAABKjgAASs4AAEsOAABLTgAAS44AAEvOAABMDgAATE4AAEyOAABMzgAATQ4AAE1OAABNjgAATc4AAE4OAABOTgAATo4AAE7OAABPDgAAT04AAE+OAABPzgAAUA4AAFBOAABQjgAAUM4AAFFOAABRjgAAUg4AAFTOAABXDgAAf84AAEcOQABHzkAASI5AAEjOQABJDkAASY5AAEnOQABKDkAASk5AAEqOQABKzkAASw5AAEtOQABLjkAAS85AAEwOQABMTkAATI5AAEzOQABNDkAATU5AAE2OQABNzkAATg5AAE5OQABOjkAATs5AAE8OQABPTkAAT45AAE/OQABQDkAAUE5AAFCOQABQzkAAUQ5AAFIOQABSTkAAUw5AAFPOQABIjoAASY6AAEnOgABKDoAASs6AAEsOgABLToAAS86AAEwOgABMToAATI6AAEzOgABNDoAATU6AAE2OgABNzoAATg6AAE7OgABPDoAAT06AAE+OgABPzoAASA7AAEjOwABJTsAASY7AAEnOwABKDsAASk7AAEqOwABKzsAASw7AAEtOwABLjsAAS87AAEwOwABMTsAATI7AAEzOwABNDsAATU7AAE2OwABNzsAATg7AAE5OwABOjsAATs7AAE8OwABPTsAAT47AAE/OwABQDsAAUI7AAFDOwABRTsAAUY7AAEgPAABITwAASI8AAEjPAABJTwAASY8AAEnPAABKDwAASk8AAEqPAABKzwAASw8AAEtPAABLjwAAS88AAEwPAABMTwAATI8AAEzPAABNDwAATU8AAE2PAABNzwAATg8AAE5PAABOjwAATs8AAE8PAABPzwAAUA8AAFWPAABID0AASU9AAEoPQABKT0AASs9AAEsPQABLT0AAS49AAEvPQABMj0AATM9AAE0PQABNT0AATY9AAE4PQABOz0AASA+AAEiPgABIz4AASY+AAEnPgABKD4AASk+AAEqPgABKz4AASw+AAEtPgABLj4AAS8+AAEwPgABMj4AATM+AAE0PgABNT4AATY+AAE3PgABOD4AATk+AAE6PgABOz4AATw+AAE9PgABPj4AAT8+AAFAPgABQj4AAUM+AAFGPgABWD4AAWI+AAFwPgAB7j4AAR4/AAEfPwABIj8AASM/AAEkPwABJT8AASg/AAEpPwABKz8AASw/AAEtPwABLj8AAS8/AAEwPwABMT8AATI/AAEzPwABND8AATU/AAE2PwABNz8AATg/AAE5PwABOz8AATw/AAE9PwABPj8AAT8/AAFMPwABIEAAASNAAAEkQAABJUAAASZAAAEnQAABKEAAASlAAAEqQAABK0AAASxAAAEtQAABLkAAAS9AAAEwQAABMUAAATNAAAE0QAABNUAAATZAAAE3QAABOEAAATlAAAE6QAABP0AAAVJAAAFYQAABI0EAASVBAAEmQQABK0EAASxBAAEuQQABL0EAATBBAAEzQQABNEEAATVBAAE4QQABOUEAASZCAAEpQgABKkIAAStCAAEsQgABLUIAAS5CAAEvQgABMkIAATNCAAE0QgABNUIAAThCAAE5QgABPEIAAUJCAAFDQgABRUIAAUhCAAFYQgABJUMAASlDAAEqQwABK0MAASxDAAEtQwABLkMAAS9DAAEwQwABMUMAATJDAAEzQwABNEMAATVDAAE2QwABQ0MAAUhDAAFJQwABWUMAASxEAAEtRAABLkQAATBEAAElRQABKEUAASlFAAErRQABLkUAAS9FAAEwRQABMkUAAThFAAE5RQABO0UAAT5FAAFIRQABTkUAAVJFAAFWRQABWEUAAXBFAAElRgABJkYAAStGAAEsRgABLkYAATNGAAE0RgABNUYAAThGAAE7RgABPEYAAUZGAAFIRgABTEYAAS5HAAElSAABKEgAAS5IAAEvSAABNUgAATZIAAE7SAABPEgAAUtIAAFMSAABTkgAASNJAAEpSQABLEkAATBJAAFMSQABTUkAAShLAAEwSwABMksAATZLAAFFSwABSEsAATBMAAE5TAABME4AAThOAAE/TwABQk8AAUlPAAFMTwABOFAAAUVQAAFDUgABS1IAATNTAAFQUwABP1gAAVVYAAFGWwABUFsAAUNeAAH/XgAB4GsAAT9vAAHmbwABW3AAAWJzAAH/fAAB/30AAc6CAAGskAABTJIAAf+WAAFYmQABrKgAAcv/AAH//wABaUUAAVhGAAFcRgABXUYAAV9GAAFgRgABZUYAAVhHAAFeSAABUkkAAWJJAAFiSgABVUsAAV5LAAFvSwABY0wAAVBPAAFZTwABYE8AAWZPAAFTUAABXFAAAVNSAAFgUgABblMAAX5TAAFcVQABYFgAAWxYAAF4WQABcFwAAQ=="

Please, help me how to convert it to an image?