reading file from server and giving popup at start up

hello;
for reading a file you can use normal system.IO functions for file streaming using C# windows application, but it depends where is your server how you are connected to it and how you want to access your file , by HTTP ?? or remote SQL reading from database??
just explain more what are you thinking about and what are your exact aims and We will help you in coding ...
regards...

how to download files using HTTP by passing Proxy server. This article explains how to pass proxy server network credentials when downloading files using HTTP.
Passing Network Credentials
If your company is using proxy server to connect to the Internet, you will have to pass proxy settings to download files from the Internet using HTTP. To do so, you need to create a WebProxy instance, and set its Credentials property, which is NetworkCredential and takes userId, password, and network domain.
Here is the code that uses network credentials:

string result = "";
try
{
WebProxy proxy = new WebProxy("http://proxy:80/", true);
proxy.Credentials = new NetworkCredential("userId", "password", "Domain"); 
WebRequest request = WebRequest.Create(http://www.c-sharpcorner.com);
request.Proxy = proxy;
// Send the 'HttpWebRequest' and wait for response. 
HttpWebResponse response = (HttpWebResponse)request.GetResponse(); System.IO.Stream stream = response.GetResponseStream();
System.Text.Encoding ec = System.Text.Encoding.GetEncoding("utf-8");
System.IO.StreamReader reader = new System.IO.StreamReader(stream, ec);
char [] chars = new Char[256];
int count = reader.Read(chars, 0, 256);
while(count > 0)
{
string str = new String(chars, 0, 256);
result = result + str;
count = reader.Read(chars, 0, 256);
}
response.Close();
stream.Close();
reader.Close();
}
catch(Exception exp)
{
string str = exp.Message;
}

Using HTTPS with WebProxy Class
When you create a WebProxy class instance for a proxy server to pass proxy to download files from the Internet using HTTP, code looks like this:
WebProxy proxy = new WebProxy("http://proxy:80/", true);
However, this code will not work when you want to download a file from HTTPS. You need to use the following code to create a WebProxy instance for HTTPS:

WebProxy myProxy = new WebProxy("server.https.com", 443);

hope that helps you .. regards..