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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.SqlServerCe;

namespace DB_Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

                SqlCeConnection conn = new SqlCeConnection("Data Source = patient.sdf;");
                conn.Open();

                SqlCeCommand command = conn.CreateCommand();

                command.CommandText = "INSERT INTO Patient(Vorname, Name, Alter) VALUES (@vname, @nam, @alte)";

                SqlCeParameter param = null;

                param = new SqlCeParameter("@vname", SqlDbType.NVarChar, 200);
                command.Parameters.Add(param);

                param = new SqlCeParameter("@nam", SqlDbType.NVarChar, 200);
                command.Parameters.Add(param);

                param = new SqlCeParameter("@alte", SqlDbType.Int, 4);
                command.Parameters.Add(param);

                command.Prepare();

                command.ExecuteNonQuery();

                command.Parameters[0].Value = textBox1.Text;
                command.Parameters[1].Value = textBox2.Text;
                command.Parameters[2].Value = textBox3.Text;

                command.ExecuteNonQuery();
                

        }
    }
}                    

1:

INSERT INTO Patient(Vorname, Name, [Alter])...