System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(string, string)已过时的解决办法

FormsAuthentication.HashPasswordForStoringInConfigFile 方法是一个在.NET 4.5中已经废弃不用的API，参见:
https://msdn.microsoft.com/zh-cn/library/system.web.security.formsauthentication.hashpasswordforstoringinconfigfile(v=vs.110).aspx
This is a solution for SH1 variant.

public static string GetSwcSH1(string value)
{
SHA1 algorithm = SHA1.Create();
byte[] data = algorithm.ComputeHash(Encoding.UTF8.GetBytes(value));
string sh1 = "";
for (int i = 0; i < data.Length; i++)
{
sh1 += data[i].ToString("x2").ToUpperInvariant();
}
return sh1;
}

For MD5 you only change algorithm to:

MD5 algorithm = MD5.Create();

参考：http://stackoverflow.com/questions/13527277/drop-in-replacement-for-formsauthentication-hashpasswordforstoringinconfigfile