Create txt file and Upload file to server in console applica

Question

This is my code :-

using (OleDbConnection connection = new OleDbConnection(connectionString))

{

OleDbCommand command = new OleDbCommand(strSQL, connection);

try

{

string filename = "C:\\Users\\Pushkar\\Desktop\\Cp1dz_rpsmohangarden_" + DateTime.Now.ToString("yyyy-dd-MM-HH-mm-ss") + ".txt";

StreamWriter sw = new StreamWriter(filename); 

connection.Open();

using (OleDbDataReader reader = command.ExecuteReader())

{

while (reader.Read())

{

sw.WriteLine("{0}, {1}, {2}, {3}", reader["AttendanceDate"].ToString(), reader["EmployeeId"].ToString(), reader["InTime"].ToString(), reader["OutTime"].ToString()); 

}

}

if (File.Exists(filename)

{

String uriString = @"http://192.168.4.99/mzc/admin/AttendanceController/upload_attendance_sheet/";

WebClient myWebClient = new WebClient();

string fileName = filename;

Console.WriteLine("Uploading {0} to {1} ...", fileName, uriString);

byte[] responseArray = myWebClient.UploadFile(uriString, fileName);

Console.WriteLine("\nResponse Received.The contents of the file uploaded are:\n{0}", System.Text.Encoding.ASCII.GetString(responseArray));

}

}

catch (Exception ex)

{

Console.WriteLine(ex.Message);

}

}    

 

 

 And i am getting error :-

 

 

 System.IO.IOException: The process cannot access the file 'C:\Users\Pushkar\Desktop\(generated txt file name)txt' because it is being used by another process.

 

 

 

 

Please Guide me