C# CryptoStream / DESCryptoServiceProvider

Hello, I need to decrypt some strings, i have the strKey and strIV but i can't find how to decrypt the strings. If you understand the code and know how to decrypt it contact me. Example of string: (Strings are not correct it's just an example.) [login to view URL] = new NetworkCredential(Decrypt("xAU5apNPqm5HBXCQD7xDjA=="), Decrypt("TN0apjWvuXjL4GhEezF6RbR0Opifb468v17GxbVnxy50t7VfIxbOVnyEMg9BHnO6QwB/IAtUPtk=")); Example of config (strkey and strIV are not correct it's just an example.) public static string strKey = "12345678";//12345678 public static string strIV = "ABCDEFGH";//ABCDEFGH public static string Decrypt(string _strQ) { _strQ = [login to view URL]("%", "+"); byte[] buffer = [login to view URL](_strQ); MemoryStream ms = new MemoryStream(); DESCryptoServiceProvider tdes = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(ms, [login to view URL]([login to view URL](strKey), [login to view URL](strIV)), [login to view URL]); [login to view URL](buffer, 0, [login to view URL]); [login to view URL](); return [login to view URL]([login to view URL]()); }