Method of C accessing access database through oledb

This article illustrates how C # accesses access database through oledb. Share it for your reference. The specific analysis is as follows:

This demonstrates how to use the Microsoft Access database in C #. Includes how to create a dataset and add tables to the dataset from the database.

// OleDbSample.cs
//  To generate this example from the command line, use the command: 
// csc oledbsample.cs
using System;
using System.Data;
using System.Data.OleDb;
using System.Xml.Serialization;
public class MainClass 
{
 public static void Main ()
 {
  //  Set the access connection and select the string. 
  //  If you build this example from the command line, 
  //  You must change the  BugTypes.MDB  Path of: 
#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 a dataset and add to it  Categories  Table: 
  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();
  }
  // 1 A dataset can contain multiple tables, so you can put all these tables into 
  // 1 Array of: 
  DataTableCollection dta = myDataSet.Tables;
  foreach (DataTable dt in dta)
  {
   Console.WriteLine("Found data table {0}", dt.TableName);
  }
  //  The following two lines show two different methods that you can use to get a dataset 
  //  Table count of: 
  Console.WriteLine("{0} tables in data set", myDataSet.Tables.Count);
  Console.WriteLine("{0} tables in data set", dta.Count);
  //  The following lines show how to do this by name 
  //  Getting information about a specific table from a dataset: 
  Console.WriteLine("{0} rows in Categories table", myDataSet.Tables["Categories"].Rows.Count);
  //  Column information is automatically extracted from the database, so 
  //  You can see this information 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, and then print the name of the column 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  CategoryID  As a subscript, and then print  CategoryName : 
   Console.WriteLine("CategoryName[{0}] is {1}", dr[0], dr[1]);
  }
 }
}

I hope this article is helpful to everyone's C # programming.