C# dns raise no such host is known

Hello ,

i have to try to connect one ip address in my desktop application with the 

dns.beginhostentry but it gives error "no such host is known" 

while i am using with alias its works fine for the same ip 

address. 

example :

string ip_address ="123.456.789.012" 
string alias = "mymachine" 'this is alias of above ip address.

DNS.BeginGetHostEntry(ip_address,abcd,this); this statement does 

not works. it show the error that "no such host is known".

while

DNS.BeginGetHostEntry(alias,abcd,this);

this statement does works no issues at all.



please solve this query.

thanks

Note : i dont want to do host entry into the host file of the any 

particular pc. because i want to fix the ip address at all.