error in insert data

try
            {
                OleDbConnection con;
                OleDbCommand com;
string path = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\user\Documents\Visual Studio2010\Projects\insert1\insert1\bin\Debug\insert.accdb";
                con = new OleDbConnection(path);   
                con.Open();
                MessageBox.Show("connected");
string query = "insert into user(username,password) values ('" + textBox1.Text + "','" + textBox2.Text + "')";
                com = new OleDbCommand(query);
                com.Connection = con;
                if (com.ExecuteNonQuery() > 0)
                {
                    MessageBox.Show("data inserted");
                }
                else
                {
                    MessageBox.Show("not inserted");
                }
                con.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }