// OleDbSample.cs
using System;
using System.Data;
using System.Data.OleDb;
using System.Xml.Serialization;

public class MainClass {
    public static void Main ()
    {
            // Set Access connection and select strings.
            // The path to BugTypes.MDB must be changed if you build
            // the sample from the command line:
#if USINGPROJECTSYSTEM
            string strAccessConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\\..\\BugTypes.MDB";
#else
            string strAccessConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=BugTypes.MDB";
#endif
            string strAccessSelect = "SELECT * FROM Categories";

            // Create the dataset and add the Categories table to it:
            DataSet myDataSet = new DataSet();
            OleDbConnection myAccessConn = null;
            try
            {
                  myAccessConn = new OleDbConnection(strAccessConn);
            }
            catch(Exception ex)
            {
                  Console.WriteLine("Error: Failed to create a database connection. \n{0}", ex.Message);
                  return;
            }

            try
            {

                  OleDbCommand myAccessCommand = new OleDbCommand(strAccessSelect,myAccessConn);
                  OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(myAccessCommand);

                  myAccessConn.Open();
                  myDataAdapter.Fill(myDataSet,"Categories");

            }
            catch (Exception ex)
            {
                  Console.WriteLine("Error: Failed to retrieve the required data from the DataBase.\n{0}", ex.Message);
                  return;
            }
            finally
            {
                  myAccessConn.Close();
            }

            // A dataset can contain multiple tables, so let's get them
            // all into an array:
            DataTableCollection dta = myDataSet.Tables;
            foreach (DataTable dt in dta)
            {
            Console.WriteLine("Found data table {0}", dt.TableName);
            }

            // The next two lines show two different ways you can get the
            // count of tables in a dataset:
            Console.WriteLine("{0} tables in data set", myDataSet.Tables.Count);
            Console.WriteLine("{0} tables in data set", dta.Count);
            // The next several lines show how to get information on
            // a specific table by name from the dataset:
            Console.WriteLine("{0} rows in Categories table", myDataSet.Tables["Categories"].Rows.Count);
            // The column info is automatically fetched from the database,
            // so we can read it here:
            Console.WriteLine("{0} columns in Categories table", myDataSet.Tables["Categories"].Columns.Count);
            DataColumnCollection drc = myDataSet.Tables["Categories"].Columns;
            int i = 0;
            foreach (DataColumn dc in drc)
            {
                  // Print the column subscript, then the column's name
                  // and its data type:
                  Console.WriteLine("Column name[{0}] is {1}, of type {2}",i++ , dc.ColumnName, dc.DataType);
            }
            DataRowCollection dra = myDataSet.Tables["Categories"].Rows;
            foreach (DataRow dr in dra)
            {
                  // Print the CategoryID as a subscript, then the CategoryName:
                  Console.WriteLine("CategoryName[{0}] is {1}", dr[0], dr[1]);
            }

   }