Multiples Table in DataReader

Question

I normally use DataSet because It is very flexible. Recently I am assigned code optimization task , To reduce hits to the database I am changing two queries in a procedure. one Query returns the count and the other returns the actual data. That is , My stored procedure returns two tables. Now, I know how to read both tables using DataSets, But I need to read both tables using DataReader. In search of that I found This.

I follow the article and wrote my code like this:

dr = cmd.ExecuteReader(); while (dr.Read()) {   } if (dr.NextResult()) // this line throws exception {    while (dr.Read()) { 

But I am getting an exception at dt.NextResult. Exception is :

Invalid attempt to call NextResult when reader is closed. 

I also googled above error , but still not able to solve the issue. Any help will be much appreciated. I need to read multiple tables using datareader, is this possible?

Answer 1

Try this because this will close connection ,data reader and command once task get over , so that this will not give datareader close exception

Also do check like this if(reader.NextResult()) to check there is next result,

using (SqlConnection connection = new SqlConnection("connection string here")) {     using (SqlCommand command = new SqlCommand            ("SELECT Column1 FROM Table1; SELECT Column2 FROM Table2", connection))     {         connection.Open();          using (SqlDataReader reader = command.ExecuteReader())         {             while (reader.Read())             {                 MessageBox.Show(reader.GetString(0), "Table1.Column1");             }              if(reader.NextResult())             {                while (reader.Read())               {                 MessageBox.Show(reader.GetString(0), "Table2.Column2");               }             }         }     } }