How to efficiently write to file from SQL datareader in c#?

Question

I have a remote sql connection in C# that needs to execute a query and save its results to the users\'s local hard disk. There is a fairly large amount of data this thing ca

Answer 1

I agree that your best bet here would be to use a SqlDataReader. Something like this:

StreamWriter YourWriter = new StreamWriter(@"c:\testfile.txt");
SqlCommand YourCommand = new SqlCommand();
SqlConnection YourConnection = new SqlConnection(YourConnectionString);
YourCommand.Connection = YourConnection;
YourCommand.CommandText = myQuery;

YourConnection.Open();

using (YourConnection)
{
    using (SqlDataReader sdr = YourCommand.ExecuteReader())
        using (YourWriter)
        {
            while (sdr.Read())
                YourWriter.WriteLine(sdr[0].ToString() + sdr[1].ToString() + ",");

        }
}

Mind you, in the while loop, you can write that line to the text file in any format you see fit with the column data from the SqlDataReader.