Question

I am adding records to my database via a windows form. But when ever I add a new record it doesnt update until I close the app and then start again. Even though I think I am telling it to update (Im obv not!!)

Do I need a new varibale to update the database? Im a little stuck.

EDIT: All code on this..

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;

namespace MediaManagementSystem
{
public partial class AddMedia : Form
{
    //database var
    OleDbConnection m_cnADONetConnection = new OleDbConnection();
    OleDbDataAdapter m_daDataAdapter;
    OleDbDataAdapter m_cbCommandBuilder;
    DataTable m_dtMedia = new DataTable();
    int m_rowPosition = 0;

    public AddMedia()
    {
        InitializeComponent();
    }

    private void BrowseButton_Click(object sender, EventArgs e)
    {
        //load up file dialog and find media
        if (addFileDialog.ShowDialog() == DialogResult.OK)
        {
            //add media file name to file path text box
            txtFilePath.Text = addFileDialog.FileName;
        }
    }

    private void CancelButton_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void AddButton_Click(object sender, EventArgs e)
    {
        //add the new record to the database
        DataRow drNewRow = m_dtMedia.NewRow();
        drNewRow["FilePath"] = txtFilePath.Text;
        drNewRow["Subject"] = txtSubject.Text;
        drNewRow["Title"] = txtTitle.Text;
        drNewRow["Keywords"] = txtKeywords.Text;
        drNewRow["MediaType"] = AddComboBox.Text;
        m_dtMedia.Rows.Add(drNewRow);

        m_daDataAdapter.Update(m_dtMedia);
        m_rowPosition = m_dtMedia.Rows.Count - 1;
        this.ShowCurrentRecord();
        this.Close();
    }

    private void AddMedia_Load(object sender, EventArgs e)
    {
        //link to the database and conect to database
        m_cnADONetConnection.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\Max\Documents\Visual Studio 2010\Projects\MediaManagementSystem\MediaManagementSystem\bin\Debug\MediaDB.mdb";
        m_cnADONetConnection.Open();
        OleDbConnection objConnection = new OleDbConnection(m_cnADONetConnection.ConnectionString);

        m_daDataAdapter = new OleDbDataAdapter("Select * From Media", m_cnADONetConnection);

        OleDbCommandBuilder m_cbCommandBuilder = new OleDbCommandBuilder(m_daDataAdapter);
        m_daDataAdapter.Fill(m_dtMedia);
        m_daDataAdapter.Update(m_dtMedia);
    }

    public void ShowCurrentRecord()
    {
        m_daDataAdapter.Update(m_dtMedia);   

        if (m_dtMedia.Rows.Count == 0)
        {
            txtFilePath.Text = "";
            txtSubject.Text = "";
            txtTitle.Text = "";
            txtKeywords.Text = "";
            AddComboBox.Text = "";
            return;
        }
        txtFilePath.Text = m_dtMedia.Rows[m_rowPosition]["FilePath"].ToString();
        txtSubject.Text = m_dtMedia.Rows[m_rowPosition]["Subject"].ToString();
        txtTitle.Text = m_dtMedia.Rows[m_rowPosition]["Title"].ToString();
        txtKeywords.Text = m_dtMedia.Rows[m_rowPosition]["Keywords"].ToString();
        AddComboBox.Text = m_dtMedia.Rows[m_rowPosition]["MediaType"].ToString();
    }
}

}

Answer 1

It would best if you use DataSet and then update the records in it. Finally you need to call AcceptChanges() after the update() command to commit the changes with dataset something as below also reload the data after to enter to get the recent data info:
dataset.AcceptChanges()