1. Simple MS Access operations
Monday Nov 14, 2005

2. Sample Application

3. Step One: create the database

4. Connecting to the Database
private void Form1_Load(object sender, System.EventArgs e) {
// connect to the existing Access Database
string cmd = "Select name,qnty from Table1";
string connect = "provider=Microsoft.JET.OLEDB.4.0;
data source = c:\\products.mdb";
myAdapter = new OleDbDataAdapter(cmd, connect);
// get the data from the database
DataSet mydata = new DataSet();
myAdapter.Fill (mydata, "Table1");
mytable = mydata.Tables[0];
// fill up the comboBox with the rows
foreach (DataRow dataRow in mytable.Rows)
comboBox1.Items.Add(dataRow["name"]); }

5. Really Simple Query
private void btn_quantity_Click(object sender, System.EventArgs e) {
// connect again
string cmd = "Select name,qnty from Table1";
string connect = "provider=Microsoft.JET.OLEDB.4.0;
data source = c:\\products.mdb";
myAdapter = new OleDbDataAdapter(cmd, connect);
// get a fresh copy of the database
DataSet mydata = new DataSet();
myAdapter.Fill (mydata, "Table1");
mytable = mydata.Tables[0];
// look for the item and show its qnty
foreach (DataRow dataRow in mytable.Rows)
if (String.Compare(dataRow["name"].ToString(),comboBox1.Text) == 0)
MessageBox.Show("There are " + dataRow["qnty"].ToString(), }

6. Really Simple Remove
private void btn_Delete_Click(object sender, System.EventArgs e) {
// update the database
foreach (DataRow dataRow in mytable.Rows)
if (String.Compare(dataRow["name"].ToString(),comboBox1.Text) == 0)
dataRow.Delete(); }
comboBox1.Items.Remove(comboBox1.Text);