C# console application

thanks for yours help.
But i am not understand yours point ,actually i have to deploy a mail in my application but i want that from address, to address it takes from a file .can you help me by changing my existing code. 

I have already used that but when i am passing the file data to from addresses ,to addresses it is not taken by them .They takes null values. 
Below is my code
 
string fromfile = @"D:\LogRotation\FromFile\FromFile.txt";
StreamReader fromtext = new StreamReader(fromfile);
string allfrom = fromtext.ReadToEnd();//here i received file data.
fromtext.Close();
//oMsg.From = "allfrom "; when i am using this i am not able to do that 
 
oMsg.From = [email protected];    //only this works

You can use System.IO namespace and using TextReader, StreamReader , you can read the text file.