I wrote below coding ,and last Message "Test" never appear in my project ,it means while loop never works.Plase tell me what is problem in my coding

public partial class Form1 : Form
        public static int Number_Records;
        public static DataSet ds;
        public static DataTable dt;
        public static int Next_Number;
        public Form1()

            DataSet ds = new DataSet();
            DataTable dt = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
            DataTable dt1 = new DataTable();
            SqlConnection con = new SqlConnection("Server=IT-Test;Database=NTY;user id=sa;password=12345");
                string str = "select ExecutiveCode from dbo.RDExecutive order by ExecutiveCode";
                SqlCommand cmd = new SqlCommand(str, con);
                SqlDataReader CurrentOutLet1 = cmd.ExecuteReader();

                int i = 0;
                while (CurrentOutLet1.Read())

                  Number_Records= i++;
                for (int y1 = 0; y1 <  CurrentOutLet1.FieldCount; y1++)
                  //  MessageBox.Show(CurrentOutLet1.FieldCount.ToString());

                while (CurrentOutLet1.Read())


No "Test" message.


Simple, the first while loop already read through the entire data reader, so there is nothing left to read by the time you get to the last while loop.

Seems that you are going about it the hard way. Why not just use an SqlDataAdapter and fill the dtl table. That way, it automatically will get all of the columns, and the data in one method call.

commented: Correct +7