private void button2_Click(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection();
string connStr;
connStr = "Provider=Microsoft.Jet.OLEDB.4.0;";
connStr += "Data Source= " + Application.StartupPath.ToString() + @"\ex1.mdb";
conn.ConnectionString = connStr;
conn.Open();
OleDbCommand cmd = new OleDbCommand("insert into tabela(nome) values('" + textBox1.Text + "')", conn);
cmd.ExecuteNonQuery();
}