MD5加密(16/32)

public string MD5(string str, int code)
{

if (code == 16) //16位MD5加密（取32位加密的9~25字符）
{

return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8,16);

}

else//32位加密
{

return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();

}

}

下面调用即可

string stroldpsd = MD5(txtpsd.Text.ToString().Trim(),16).ToString();