Share point list add items using C# code (windows application)

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.NET3.0

C#3.0

C#

ASP

ASP.NET

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I want to update share point list programatically.
I got the code and its working in my local machine.
Now i want to do the same in production.
But here the problem is , in my local site code taking the default system user name and password.
But in production i want pass username and password to add items in that sharepoint site.
how to do this?
below is my code

ClientContext clientContext = new ClientContext(siteUrl);
SP.List oList = clientContext.Web.Lists.GetByTitle("listname");//Share point List name

ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();
ListItem oListItem = oList.AddItem(itemCreateInfo);

//Adding list items
oListItem["Name"] = "help me plz";
oListItem["Age"] = "25";

oListItem.Update();
clientContext.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;// what i have to do here ??????????
clientContext.ExecuteQuery();