How to get number of rows using SqlDataReader in C#

Question

My question is how to get the number of rows returned by a query using SqlDataReader in C#. I\'ve seen some answers about this but none were clearly defined exc

Answer 1

to complete of Pit answer and for better perfromance : get all in one query and use NextResult method.

using (var sqlCon = new SqlConnection("Server=127.0.0.1;Database=MyDb;User Id=Me;Password=glop;"))
{
    sqlCon.Open();
    var com = sqlCon.CreateCommand();
    com.CommandText = "select * from BigTable;select @@ROWCOUNT;";
    using (var reader = com.ExecuteReader())
    {
        while(reader.read()){
            //iterate code
        }
        int totalRow = 0 ;
        reader.NextResult(); // 
        if(reader.read()){
            totalRow = (int)reader[0];
        }
    }
    sqlCon.Close();
}