Dataset Object represents a collection of data retrieved from the Data Source. The OleDbDataAdapter object allows us to populate DataTable in a DataSet. We can use Fill method in the OleDbDataAdapter Object for populating data in a Dataset. The Dataset can contain more than one Table at a time. The data set may comprise data for one or more members, corresponding to the number of rows.
The data inside Table is in the form of Rows and Columns . The DataRow class represents the actual data contained in a table. You use the DataRow and its properties and methods to retrieve, evaluate, and manipulate the data in a table. In some situations we have to find the column headers in a DataTable. There is a ColumnsCollection Object in the Datatable hold the column Definitions. The following C# Source Code shows how to find Column Definitions from a Datatable.
using System;
using System.Data;
using System.Data.OleDb;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string connetionString = null;
OleDbConnection connection ;
OleDbDataAdapter oledbAdapter ;
DataSet ds = new DataSet();
DataTable dt ;
string sql = null;
int i = 0;
connetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Your mdb filename;";
sql = "Your SQL Statement Here";
connection = new OleDbConnection(connetionString);
try
{
connection.Open();
oledbAdapter = new OleDbDataAdapter(sql, connection);
oledbAdapter.Fill(ds, "OLEDB Temp Table");
oledbAdapter.Dispose();
connection.Close();
dt = ds.Tables[0];
for (i = 0; i <= dt.Columns.Count - 1; i++)
{
MessageBox.Show (dt.Columns[i].ColumnName);
}
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection ! ");
}
}
}
}