how to add column in excel using C#

Question

string connectionstring = "Server=(local);initial catalog=Test;Trusted_Connection=True";

SqlConnection sqlConnection = new SqlConnection(connectionstring);

SqlCommand cmd = new SqlCommand();

SqlDataReader reader;

DataSet ds = new DataSet();

cmd.CommandText = "select * from Empdetails";

cmd.CommandText += " where shifttype = @par ";

cmd.Parameters.Add("@par", SqlDbType.Int).Value = j;

cmd.CommandType = CommandType.Text;

cmd.Connection = sqlConnection;

sqlConnection.Open();

reader = cmd.ExecuteReader();

if (reader.HasRows)

{

System.IO.StreamWriter sw_In = new System.IO.StreamWriter(@"C:\Users\God\Desktop\DataDump\" + j + "Excel.xls");

while (reader.Read())

{

for (int i = 0; i < reader.FieldCount; i++)

{

sw_In.AutoFlush = true;

sw_In.Write(reader[i].ToString() + "\t");

}

sw_In.Write("\n");

}

}

sqlConnection.Close();

reader.Close();

When i  run the above code in excel record as follows 

     1    Suresh    9867689098    IN   Chennai  

     2    Rajesh    9840512112    IN   Chennai   

     3    Vikash    9844521213    IN   Chennai  

     4    Ramesh    9955454213    IN   Chennai 

     5    Kumar     9840521210    IN   Chennai

 

But  in table select * from Empdetails record as follows with column name 

       ID     Name           Mobile       Shift        Place

    1    Suresh    9867689098    IN   Chennai  
    2    Rajesh    9840512112    IN   Chennai   
    3    Vikash    9844521213    IN   Chennai  
    4    Ramesh    9955454213    IN   Chennai 
    5    Kumar     9840521210    IN   Chennai
In excel the above column to be there.
 for that how can i do in asp,net using C#.   
in excel with column name records to be there.