[DllImport("advapi32.DLL", SetLastError = true)]
public static extern int LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

IntPtr admin_token = default(IntPtr);
WindowsIdentity wid_admin = null;
WindowsImpersonationContext wic = null;

//在程序中模拟域帐户登录
if (WinLogonHelper.LogonUser("uid", "serverdomain", "pwd", 9, 0, ref admin_token) != 0)
{
using (wid_admin = new WindowsIdentity(admin_token))
{
using (wic = wid_admin.Impersonate())
{
//假定要操作的文件路径是10.0.250.11上的d:\txt.txt文件可以这样操作
FileInfo file = new FileInfo(@"\\10.0.250.11\d$\txt.txt");
//想做什么操作就可以做了
}
}
}